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-  <meta content="5ccf3ff5ef8e38269d5731a34d7c6d59c349310d" name="document-revision">
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@@ -2057,7 +2057,7 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
      <a href="#obu-syntax"><span class="secno">3</span> <span class="content">Open Bitstream Unit (OBU) Syntax and Semantics</span></a>
      <ol class="toc">
       <li><a href="#immersiveaudio-obu"><span class="secno">3.1</span> <span class="content">Immersive Audio OBU Syntax and Semantics</span></a>
-      <li><a href="#obu-header"><span class="secno">3.2</span> <span class="content">OBU Header Syntax and Semantics</span></a>
+      <li><a href="#obu-header-syntax"><span class="secno">3.2</span> <span class="content">OBU Header Syntax and Semantics</span></a>
       <li><a href="#obu-reserved"><span class="secno">3.3</span> <span class="content">Reserved OBU Syntax and Semantics</span></a>
       <li><a href="#obu-iasequenceheader"><span class="secno">3.4</span> <span class="content">IA Sequence Header OBU Syntax and Semantics</span></a>
       <li><a href="#obu-codecconfig"><span class="secno">3.5</span> <span class="content">Codec Config OBU Syntax and Semantics</span></a>
@@ -2349,13 +2349,13 @@ <h5 class="heading settled" data-level="2.3.2.1" id="bitstream-descriptors"><spa
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="descriptors">Descriptors</dfn> contain all the information that is required to set up and configure the decoders, reconstruction algorithms, renderers, and mixers. <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors⑧">Descriptors</a> do not contain audio signals.</p>
    <ul>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-sequence-header-obu">IA Sequence Header OBU</dfn> indicates the start of a full <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦">IA Sequence</a> description and contains information related to profiles.</p>
+     <p>The <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu">IA Sequence Header OBU</a> indicates the start of a full <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦">IA Sequence</a> description and contains information related to profiles.</p>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="codec-config-obu">Codec Config OBU</dfn> provides information which is required for setting up a decoder for a coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①③">Audio Substream</a>.</p>
+     <p>The <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu">Codec Config OBU</a> provides information which is required for setting up a decoder for a coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①③">Audio Substream</a>.</p>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-element-obu">Audio Element OBU</dfn> provides information which is required for combining one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①④">Audio Substream</a>s to reconstruct an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④">Audio Element</a>.</p>
+     <p>The <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu">Audio Element OBU</a> provides information which is required for combining one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①④">Audio Substream</a>s to reconstruct an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④">Audio Element</a>.</p>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation-obu">Mix Presentation OBU</dfn> provides information which is required for rendering and mixing one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑤">Audio Element</a>s to generate the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑥">Immersive Audio</a> output.</p>
+     <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu">Mix Presentation OBU</a> provides information which is required for rendering and mixing one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑤">Audio Element</a>s to generate the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑥">Immersive Audio</a> output.</p>
      <ul>
       <li data-md>
        <p>Multiple <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③">Mix Presentation</a>s can be defined as alternatives to each other within the same <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧">IA Sequence</a>. Furthermore, the choice of which <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation④">Mix Presentation</a> to use at playback is left to the user. For example, multi-language support is implemented by defining different <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑤">Mix Presentation</a>s, where the first mix describes the use of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑥">Audio Element</a> with English dialogue, and the second mix describes the use of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑦">Audio Element</a> with French dialogue.</p>
@@ -2365,15 +2365,15 @@ <h5 class="heading settled" data-level="2.3.2.2" id="iadata"><span class="secno"
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-data">IA Data</dfn> contains the time-varying data that is required in the generation of the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑦">Immersive Audio</a> output.</p>
    <ul>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-frame-obu">Audio Frame OBU</dfn> provides the coded audio frame for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑤">Audio Substream</a>. Each frame has an implied start timestamp and an explicitly defined duration. A coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑥">Audio Substream</a> is represented as a sequence of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu">Audio Frame OBU</a>s with the same identifier, in time order.</p>
+     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu">Audio Frame OBU</a> provides the coded audio frame for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑤">Audio Substream</a>. Each frame has an implied start timestamp and an explicitly defined duration. A coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑥">Audio Substream</a> is represented as a sequence of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①">Audio Frame OBU</a>s with the same identifier, in time order.</p>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="parameter-block-obu">Parameter Block OBU</dfn> provides the parameter values in a block for a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑧">Parameter Substream</a>. Each block has an implied start timestamp and an explicitly defined duration. A time-varying <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑨">Parameter Substream</a> is represented as a sequence of parameter values in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu">Parameter Block OBU</a>s with the same identifier, in time order.</p>
+     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu">Parameter Block OBU</a> provides the parameter values in a block for a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑧">Parameter Substream</a>. Each block has an implied start timestamp and an explicitly defined duration. A time-varying <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑨">Parameter Substream</a> is represented as a sequence of parameter values in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①">Parameter Block OBU</a>s with the same identifier, in time order.</p>
     <li data-md>
-     <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="temporal-delimiter-obu">Temporal Delimiter OBU</dfn> identifies the <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit">Temporal Unit</a>s. It may or may not be present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨">IA Sequence</a>. If present, the first OBU of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①">Temporal Unit</a> is the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu">Temporal Delimiter OBU</a>.</p>
+     <p>The <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu">Temporal Delimiter OBU</a> identifies the <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit">Temporal Unit</a>s. It may or may not be present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨">IA Sequence</a>. If present, the first OBU of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①">Temporal Unit</a> is the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①">Temporal Delimiter OBU</a>.</p>
    </ul>
    <h3 class="heading settled" data-level="2.4" id="timingmodel"><span class="secno">2.4. </span><span class="content">Timing Model</span><a class="self-link" href="#timingmodel"></a></h3>
-   <p>A coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑦">Audio Substream</a> is made of consecutive <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①">Audio Frame OBU</a>s. Each <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②">Audio Frame OBU</a> is made of audio samples at a given sample rate. The decode duration of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③">Audio Frame OBU</a> is the number of audio samples divided by the sample rate. The presentation duration of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④">Audio Frame OBU</a> is the number of audio samples remaining after trimming divided by the sample rate. The decode start time (respectively presentation start time) of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤">Audio Frame OBU</a> is the sum of the decode durations (respectively presentation durations) of previous <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑥">Audio Frame OBU</a>s in the IA Sequence, or 0 otherwise. The decode duration (respectively presentation duration) of a coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑧">Audio Substream</a> is the sum of the decode durations (respectively presentation durations) of all its <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑦">Audio Frame OBU</a>s. The decode start time of an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑨">Audio Substream</a> is the decode start time of its first <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑧">Audio Frame OBU</a>. The presentation start time of an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⓪">Audio Substream</a> is the presentation start time of its first <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑨">Audio Frame OBU</a> which is not entirely trimmed.</p>
-   <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⓪">Parameter Substream</a> is made of consecutive <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①">Parameter Block OBU</a>s. Each <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②">Parameter Block OBU</a> is made of parameter values at a given sample rate. The decode duration of a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③">Parameter Block OBU</a> is the number of parameter values divided by the sample rate. The decode start time of a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④">Parameter Block OBU</a> is the sum of the decode duration of previous <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤">Parameter Block OBU</a>s if any, 0 otherwise. The decode duration of a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①①">Parameter Substream</a> is the sum of all its <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑥">Parameter Block OBU</a>s' decode durations. The start time of a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①②">Parameter Substream</a> is the decode start time of its first <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑦">Parameter Block OBU</a>. When all parameter values in a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①③">Parameter Substream</a> are constant, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑧">Parameter Block OBU</a>s may be present in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⓪">IA Sequence</a>.</p>
+   <p>A coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑦">Audio Substream</a> is made of consecutive <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②">Audio Frame OBU</a>s. Each <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③">Audio Frame OBU</a> is made of audio samples at a given sample rate. The decode duration of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④">Audio Frame OBU</a> is the number of audio samples divided by the sample rate. The presentation duration of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤">Audio Frame OBU</a> is the number of audio samples remaining after trimming divided by the sample rate. The decode start time (respectively presentation start time) of an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑥">Audio Frame OBU</a> is the sum of the decode durations (respectively presentation durations) of previous <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑦">Audio Frame OBU</a>s in the IA Sequence, or 0 otherwise. The decode duration (respectively presentation duration) of a coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑧">Audio Substream</a> is the sum of the decode durations (respectively presentation durations) of all its <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑧">Audio Frame OBU</a>s. The decode start time of an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑨">Audio Substream</a> is the decode start time of its first <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑨">Audio Frame OBU</a>. The presentation start time of an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⓪">Audio Substream</a> is the presentation start time of its first <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⓪">Audio Frame OBU</a> which is not entirely trimmed.</p>
+   <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⓪">Parameter Substream</a> is made of consecutive <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②">Parameter Block OBU</a>s. Each <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③">Parameter Block OBU</a> is made of parameter values at a given sample rate. The decode duration of a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④">Parameter Block OBU</a> is the number of parameter values divided by the sample rate. The decode start time of a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤">Parameter Block OBU</a> is the sum of the decode duration of previous <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑥">Parameter Block OBU</a>s if any, 0 otherwise. The decode duration of a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①①">Parameter Substream</a> is the sum of all its <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑦">Parameter Block OBU</a>s' decode durations. The start time of a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①②">Parameter Substream</a> is the decode start time of its first <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑧">Parameter Block OBU</a>. When all parameter values in a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①③">Parameter Substream</a> are constant, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑨">Parameter Block OBU</a>s may be present in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⓪">IA Sequence</a>.</p>
    <p>Within an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑧">Audio Element</a>, the presentation start times of all <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②①">Audio Substream</a>s coincide and is the presentation start time of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑨">Audio Element</a>. All <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②②">Audio Substream</a>s have the same presentation duration which is the presentation duration of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⓪">Audio Element</a>.</p>
    <ul>
     <li data-md>
@@ -2383,19 +2383,19 @@ <h3 class="heading settled" data-level="2.4" id="timingmodel"><span class="secno
    </ul>
    <p>Within a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑥">Mix Presentation</a>, the presentation start time of all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②③">Audio Element</a>s coincide and all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②④">Audio Element</a>s have the same duration defining the duration of the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑦">Mix Presentation</a>.</p>
    <p>Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①①">IA Sequence</a>, all <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑧">Mix Presentation</a>s have the same duration, defining the duration of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①②">IA Sequence</a>, and have the same presentation start time defining the presentation start time of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①③">IA Sequence</a>.</p>
-   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="temporal-unit">Temporal Unit</dfn> conceptually means a set of all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⓪">Audio Frame OBU</a>s with the same decode start time and the same duration from all coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑤">Audio Substream</a>s and all non-redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑨">Parameter Block OBU</a>s with the decode start time within the duration.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="temporal-unit">Temporal Unit</dfn> conceptually means a set of all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①①">Audio Frame OBU</a>s with the same decode start time and the same duration from all coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑤">Audio Substream</a>s and all non-redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⓪">Parameter Block OBU</a>s with the decode start time within the duration.</p>
    <p>The figure below shows an example of the Timing Model in terms of the decode start times and durations of the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑥">Audio Substream</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⑥">Parameter Substream</a>.</p>
    <center><img height="1029" src="images/IAMF Timing Model.png" style="width:100%; height:auto;" width="1943"></center>
    <center>
-    <figcaption>An example of the IAMF Timing Model. AFO: Audio Frame OBU, PBO: Parameter Block OBU, \(\text{PT}x\): time \(x\) (ms) on the presentation layer’s timeline, \(\text{DT}y\): time \(y\) (ms) on the decoding layer’s timeline.</figcaption>
+    <figcaption>An example of the IAMF Timing Model. AFO: <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①②">Audio Frame OBU</a>, PBO: <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①①">Parameter Block OBU</a>, \(\text{PT}x\): time \(x\) (ms) on the presentation layer’s timeline, \(\text{DT}y\): time \(y\) (ms) on the decoding layer’s timeline.</figcaption>
    </center>
    <p class="note" role="note"><span class="marker">NOTE:</span> For a given decoded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑦">Audio Substream</a> (before trimming) and its associated <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⑦">Parameter Substream</a>(s), a decoder MAY apply trimming in 1 of 2 ways: <br> 1) The decoder processes the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑧">Audio Substream</a> using the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⑧">Parameter Substream</a>(s), and then trims the processed audio samples. <br> 2) The decoder trims both the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②⑨">Audio Substream</a> and the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⑨">Parameter Substream</a>(s). Then, the decoder processes the trimmed <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⓪">Audio Substream</a> using the trimmed <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⓪">Parameter Substream</a>(s).</p>
    <h2 class="heading settled" data-level="3" id="obu-syntax"><span class="secno">3. </span><span class="content">Open Bitstream Unit (OBU) Syntax and Semantics</span><a class="self-link" href="#obu-syntax"></a></h2>
    <p>The <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①④">IA Sequence</a> uses the OBU syntax.</p>
    <p>This section specifies the OBU syntax elements and their semantics.</p>
    <h3 class="heading settled" data-level="3.1" id="immersiveaudio-obu"><span class="secno">3.1. </span><span class="content">Immersive Audio OBU Syntax and Semantics</span><a class="self-link" href="#immersiveaudio-obu"></a></h3>
-   <p>OBUs are structured with an obu_header and an OBU payload.</p>
-   <p>The obu_header and all OBU payloads, including the reserved_obu, are byte aligned.</p>
+   <p>OBUs are structured with an <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header">OBU Header</a> and an OBU payload.</p>
+   <p>The <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header①">OBU Header</a> and all OBU payloads, including the <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu">Reserved OBU</a>, are byte aligned.</p>
    <p><b>Syntax</b></p>
 <pre>class IAOpenBitstreamUnit() {
   OBUHeader obu_header;
@@ -2422,7 +2422,8 @@ <h3 class="heading settled" data-level="3.1" id="immersiveaudio-obu"><span class
 </pre>
    <p><b>Semantics</b></p>
    <p>If the syntax element <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type">obu_type</a> is equal to OBU_IA_Sequence_Header, an ordered series of OBUs is presented to the decoding process as a string of bytes.</p>
-   <h3 class="heading settled" data-level="3.2" id="obu-header"><span class="secno">3.2. </span><span class="content">OBU Header Syntax and Semantics</span><a class="self-link" href="#obu-header"></a></h3>
+   <h3 class="heading settled" data-level="3.2" id="obu-header-syntax"><span class="secno">3.2. </span><span class="content">OBU Header Syntax and Semantics</span><a class="self-link" href="#obu-header-syntax"></a></h3>
+   <p>This section specifies the format of the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="obu-header">OBU Header</dfn>.</p>
    <p><b>Syntax</b></p>
 <pre>class OBUHeader() {
   unsigned int (5) obu_type;
@@ -2469,41 +2470,40 @@ <h3 class="heading settled" data-level="3.2" id="obu-header"><span class="secno"
    <p>For a given coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③①">Audio Substream</a>,</p>
    <ul>
     <li data-md>
-     <p>If an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①①">Audio Frame OBU</a> has its <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start">num_samples_to_trim_at_start</a> field set to a non-zero value N, the decoder SHALL discard the first N audio samples.</p>
+     <p>If an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①③">Audio Frame OBU</a> has its <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start">num_samples_to_trim_at_start</a> field set to a non-zero value N, the decoder SHALL discard the first N audio samples.</p>
     <li data-md>
-     <p>If an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①②">Audio Frame OBU</a> has its <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end">num_samples_to_trim_at_end</a> field set to a non-zero value N, the decoder SHALL discard the last N audio samples.</p>
+     <p>If an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①④">Audio Frame OBU</a> has its <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end">num_samples_to_trim_at_end</a> field set to a non-zero value N, the decoder SHALL discard the last N audio samples.</p>
    </ul>
    <p class="note" role="note"><span class="marker">NOTE:</span> Because of possible coding dependencies, discarding a sample can sometimes mean decoding the entire audio frame.</p>
    <ul>
     <li data-md>
-     <p>For a given <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①③">Audio Frame OBU</a>, the sum of <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start①">num_samples_to_trim_at_start</a> and <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end①">num_samples_to_trim_at_end</a> SHALL be less than or equal to the number of samples in the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①④">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame">num_samples_per_frame</a>).</p>
+     <p>For a given <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑤">Audio Frame OBU</a>, the sum of <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start①">num_samples_to_trim_at_start</a> and <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end①">num_samples_to_trim_at_end</a> SHALL be less than or equal to the number of samples in the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑥">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame">num_samples_per_frame</a>).</p>
    </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> This means that if one of the values is set to the number of samples in the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑤">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame①">num_samples_per_frame</a>), the other value is set to 0.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> This means that if one of the values is set to the number of samples in the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑦">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame①">num_samples_per_frame</a>), the other value is set to 0.</p>
    <ul>
     <li data-md>
-     <p>When <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start②">num_samples_to_trim_at_start</a> is non-zero, all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑥">Audio Frame OBU</a>s with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id">audio_substream_id</a>, and preceding this OBU back until the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu">Codec Config OBU</a> defining this <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③②">Audio Substream</a>, SHALL have their <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start③">num_samples_to_trim_at_start</a> field equal to the number of samples in the corresponding <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑦">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame②">num_samples_per_frame</a>).</p>
+     <p>When <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start②">num_samples_to_trim_at_start</a> is non-zero, all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑧">Audio Frame OBU</a>s with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id">audio_substream_id</a>, and preceding this OBU back until the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①">Codec Config OBU</a> defining this <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③②">Audio Substream</a>, SHALL have their <a data-link-type="dfn" href="#num_samples_to_trim_at_start" id="ref-for-num_samples_to_trim_at_start③">num_samples_to_trim_at_start</a> field equal to the number of samples in the corresponding <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑨">Audio Frame OBU</a> (i.e., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame②">num_samples_per_frame</a>).</p>
     <li data-md>
-     <p>When <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end②">num_samples_to_trim_at_end</a> is non-zero in an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑧">Audio Frame OBU</a>, there SHALL be no subsequent <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu①⑨">Audio Frame OBU</a> with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①">audio_substream_id</a> until a non-redundant <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①">Codec Config OBU</a> defining an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③③">Audio Substream</a> with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id②">audio_substream_id</a>.</p>
+     <p>When <a data-link-type="dfn" href="#num_samples_to_trim_at_end" id="ref-for-num_samples_to_trim_at_end②">num_samples_to_trim_at_end</a> is non-zero in an <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⓪">Audio Frame OBU</a>, there SHALL be no subsequent <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②①">Audio Frame OBU</a> with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①">audio_substream_id</a> until a non-redundant <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②">Codec Config OBU</a> defining an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③③">Audio Substream</a> with the same <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id②">audio_substream_id</a>.</p>
    </ul>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="obu_extension_flag">obu_extension_flag</dfn> indicates whether the <a data-link-type="dfn" href="#extension_header_size" id="ref-for-extension_header_size">extension_header_size</a> field is present. If it is set to 0, the <a data-link-type="dfn" href="#extension_header_size" id="ref-for-extension_header_size①">extension_header_size</a> field SHALL NOT be present. Otherwise, the <a data-link-type="dfn" href="#extension_header_size" id="ref-for-extension_header_size②">extension_header_size</a> field SHALL be present.</p>
    <p>This flag SHALL be set to 0 for this version of the specification. An OBU parser that is conformant with this version of the specification SHOULD ignore the <a data-link-type="dfn" href="#extension_header_bytes" id="ref-for-extension_header_bytes">extension_header_bytes</a>.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> A future version of the specification may use this flag to specify an extension header field by setting <a data-link-type="dfn" href="#obu_extension_flag" id="ref-for-obu_extension_flag">obu_extension_flag</a> = 1 and setting the size of the extended header to <a data-link-type="dfn" href="#extension_header_size" id="ref-for-extension_header_size③">extension_header_size</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="obu_size">obu_size</dfn> indicates the size in bytes of the OBU immediately following the obu_size field of the OBU. An OBU MAY have extra bytes after consuming all the bytes per the OBU syntax definition. Parsers compliant with this version of the specification SHOULD ignore the extra bytes.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_to_trim_at_end">num_samples_to_trim_at_end</dfn> indicates the number of samples that need to be trimmed from the end of the samples in this <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⓪">Audio Frame OBU</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_to_trim_at_start">num_samples_to_trim_at_start</dfn> indicates the number of samples that need to be trimmed from the start of the samples in this <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②①">Audio Frame OBU</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_to_trim_at_end">num_samples_to_trim_at_end</dfn> indicates the number of samples that need to be trimmed from the end of the samples in this <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②②">Audio Frame OBU</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_to_trim_at_start">num_samples_to_trim_at_start</dfn> indicates the number of samples that need to be trimmed from the start of the samples in this <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②③">Audio Frame OBU</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="extension_header_size">extension_header_size</dfn> indicates the size in bytes of the extension header immediately following this field.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="extension_header_bytes">extension_header_bytes</dfn> indicates the byte representations of the syntaxes of the extension header.</p>
    <h3 class="heading settled" data-level="3.3" id="obu-reserved"><span class="secno">3.3. </span><span class="content">Reserved OBU Syntax and Semantics</span><a class="self-link" href="#obu-reserved"></a></h3>
-   <p>Reserved OBUs SHOULD be ignored by parsers compliant with this version of the specification. Future versions of the specification MAY define syntax and semantics for these reserved OBUs that would only be supported by parsers compliant with these future versions.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="reserved-obu">Reserved OBU</dfn>s SHOULD be ignored by parsers compliant with this version of the specification. Future versions of the specification MAY define syntax and semantics for these <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu①">Reserved OBU</a>s that would only be supported by parsers compliant with these future versions.</p>
    <p><b>Syntax</b></p>
 <pre>class ReservedOBU() {
 }
 </pre>
    <h3 class="heading settled" data-level="3.4" id="obu-iasequenceheader"><span class="secno">3.4. </span><span class="content">IA Sequence Header OBU Syntax and Semantics</span><a class="self-link" href="#obu-iasequenceheader"></a></h3>
-   <p>This section specifies the OBU payload of the IA Sequence Header OBU.</p>
-   <p>This OBU is used to indicate the start of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑥">IA Sequence</a>. So, the first OBU in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑦">IA Sequence</a> SHALL have <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type④">obu_type</a> = OBU_IA_Sequence_Header.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> When an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑧">IA Sequence</a> is stored in a file, the <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu">IA Sequence Header OBU</a> can be used to identify that the file contains an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑨">IA Sequence</a>.</p>
-   <p>This OBU MAY be placed frequently within one single <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⓪">IA Sequence</a> for an application such as broadcasting or multicasting. In that case, all <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①">IA Sequence Header OBU</a>s except the first one SHALL be marked as redundant (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy①">obu_redundant_copy</a> = 1). So, if a decoder encounters a non-redundant <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu②">IA Sequence Header OBU</a> (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy②">obu_redundant_copy</a> = 0), and it has also received the previous <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu③">IA Sequence Header OBU</a>, the non-redundant <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu④">IA Sequence Header OBU</a> indicates the start of a new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②①">IA Sequence</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-sequence-header-obu">IA Sequence Header OBU</dfn> is used to indicate the start of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑥">IA Sequence</a>, i.e., the first OBU in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑦">IA Sequence</a> SHALL have <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type④">obu_type</a> = OBU_IA_Sequence_Header.  This section specifies the payload format of the <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①">IA Sequence Header OBU</a>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> When an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑧">IA Sequence</a> is stored in a file, the <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu②">IA Sequence Header OBU</a> can be used to identify that the file contains an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence①⑨">IA Sequence</a>.</p>
+   <p>This OBU MAY be placed frequently within one single <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⓪">IA Sequence</a> for an application such as broadcasting or multicasting. In that case, all <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu③">IA Sequence Header OBU</a>s except the first one SHALL be marked as redundant (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy①">obu_redundant_copy</a> = 1). So, if a decoder encounters a non-redundant <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu④">IA Sequence Header OBU</a> (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy②">obu_redundant_copy</a> = 0), and it has also received the previous <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑤">IA Sequence Header OBU</a>, the non-redundant <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑥">IA Sequence Header OBU</a> indicates the start of a new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②①">IA Sequence</a>.</p>
    <p><b>Syntax</b></p>
 <pre>class IASequenceHeaderOBU() {
   unsigned int (32) ia_code;
@@ -2513,7 +2513,7 @@ <h3 class="heading settled" data-level="3.4" id="obu-iasequenceheader"><span cla
 </pre>
    <p><b>Semantics</b></p>
    <p><dfn data-dfn-type="dfn" data-noexport id="ia_code">ia_code<a class="self-link" href="#ia_code"></a></dfn> is a ‘four-character code’ (4CC), <code>iamf</code>.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> When IA OBUs are delivered over a protocol that does not provide explicit <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②②">IA Sequence</a> boundaries, a parser may locate the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②③">IA Sequence</a> start by searching for the code <code>iamf</code> preceded by specific OBU header values. For example, by assuming that <a data-link-type="dfn" href="#obu_extension_flag" id="ref-for-obu_extension_flag①">obu_extension_flag</a> is set to 0 and because <a data-link-type="dfn" href="#obu_trimming_status_flag" id="ref-for-obu_trimming_status_flag">obu_trimming_status_flag</a> is set to 0 for an <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑤">IA Sequence Header OBU</a>, the OBU header can be either 0xF806 or 0xFC06.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> When IA OBUs are delivered over a protocol that does not provide explicit <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②②">IA Sequence</a> boundaries, a parser may locate the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②③">IA Sequence</a> start by searching for the code <code>iamf</code> preceded by specific <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header②">OBU Header</a> values. For example, by assuming that <a data-link-type="dfn" href="#obu_extension_flag" id="ref-for-obu_extension_flag①">obu_extension_flag</a> is set to 0 and because <a data-link-type="dfn" href="#obu_trimming_status_flag" id="ref-for-obu_trimming_status_flag">obu_trimming_status_flag</a> is set to 0 for an <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑦">IA Sequence Header OBU</a>, the <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header③">OBU Header</a> can be either 0xF806 or 0xFC06.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="primary_profile">primary_profile</dfn> indicates the primary profile that this <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②④">IA Sequence</a> complies with. Parsers compliant with this version of the specification SHOULD discard the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑤">IA Sequence</a> if they do not support the value indicated here.</p>
    <p>The mappings below are applied for both <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile">primary_profile</a> and <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile">additional_profile</a>.</p>
    <ul>
@@ -2525,9 +2525,11 @@ <h3 class="heading settled" data-level="3.4" id="obu-iasequenceheader"><span cla
      <p>2~255: Reserved</p>
    </ul>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="additional_profile">additional_profile</dfn> indicates an additional profile that this <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑥">IA Sequence</a> complies with. If an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑦">IA Sequence</a> only complies with the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①">primary_profile</a>, this field SHALL be set to the same value as <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile②">primary_profile</a>.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> If a future version defines a new profile, e.g., HypotheticalProfile, that is backward compatible with the Base profile, for example by defining new OBUs that would be ignored by the Base-compatible parser, an IA writer can decide to set the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile③">primary_profile</a> to "Base Profile" while setting the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile①">additional_profile</a> to "HypotheticalProfile". This way an old processor will know it can parse and produce an acceptable rendering, while a new processor still knows it can produce a better result because it will not ignore the additional features.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> If a future version defines a new profile, e.g., HypotheticalProfile, that is backward compatible with the <a href="#profiles-base">Base Profile</a>, for example by defining new OBUs that would be ignored by the Base-compatible parser, an IA writer can decide to set the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile③">primary_profile</a> to "Base Profile" while setting the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile①">additional_profile</a> to "HypotheticalProfile". This way an old processor will know it can parse and produce an acceptable rendering, while a new processor still knows it can produce a better result because it will not ignore the additional features.</p>
    <h3 class="heading settled" data-level="3.5" id="obu-codecconfig"><span class="secno">3.5. </span><span class="content">Codec Config OBU Syntax and Semantics</span><a class="self-link" href="#obu-codecconfig"></a></h3>
-   <p>This section specifies the OBU payload of the Codec Config OBU.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="codec-config-obu">Codec Config OBU</dfn> provides information on how to set up a decoder for a coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③④">Audio Substream</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="codecconfig">CodecConfig()</dfn> class provides codec-specific configurations for the decoder.</p>
+   <p>This section specifies the payload format of the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu③">Codec Config OBU</a> and the <a data-link-type="dfn" href="#codecconfig" id="ref-for-codecconfig">CodecConfig()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class CodecConfigOBU() {
   leb128() codec_config_id;  
@@ -2542,22 +2544,23 @@ <h3 class="heading settled" data-level="3.5" id="obu-codecconfig"><span class="s
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-for="codec_config_obu" data-dfn-type="dfn" data-noexport id="codec_config_obu-codec_config_id">codec_config_id</dfn> defines an identifier for a codec configuration. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑧">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id">codec_config_id</a> per codec. There SHALL be exactly one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②">Codec Config OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors⑨">Descriptors</a>. <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑤">Audio Element</a>s use this identifier to indicate that its corresponding <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③④">Audio Substream</a>s are coded with this codec configuration.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="codec_id">codec_id</dfn> indicates a ‘four-character code’ (4CC) to identify the codec used to generate the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑤">Audio Substream</a>s. For this version of the specification, it SHALL be set to one of the four <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id">codec_id</a> values defined below:</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="codec_config_obu" data-dfn-type="dfn" data-noexport id="codec_config_obu-codec_config_id">codec_config_id</dfn> defines an identifier for a codec configuration. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑧">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id">codec_config_id</a> per codec. There SHALL be exactly one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu④">Codec Config OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors⑨">Descriptors</a>. <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑤">Audio Element</a>s use this identifier to indicate that its corresponding <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑤">Audio Substream</a>s are coded with this codec configuration.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="codec_config">codec_config<a class="self-link" href="#codec_config"></a></dfn> is an instance of the <a data-link-type="dfn" href="#codecconfig" id="ref-for-codecconfig①">CodecConfig()</a> class, which provides codec-specific information for seting up the decoder.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="codec_id">codec_id</dfn> indicates a ‘four-character code’ (4CC) to identify the codec used to generate the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑥">Audio Substream</a>s. For this version of the specification, it SHALL be set to one of the four <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id">codec_id</a> values defined below:</p>
    <ul>
     <li data-md>
-     <p><code>Opus</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑥">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑥">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-rfc-6716" title="Definition of the Opus Audio Codec">[RFC-6716]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config">decoder_config</a> structure SHALL comply with the constraints given in <a href="#opus-specific">§ 3.11.1 OPUS Specific</a>.</p>
+     <p><code>Opus</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑦">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑥">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-rfc-6716" title="Definition of the Opus Audio Codec">[RFC-6716]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config">decoder_config</a> structure SHALL comply with the constraints given in <a href="#opus-specific">§ 3.11.1 OPUS Specific</a>.</p>
     <li data-md>
-     <p><code>mp4a</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑦">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑦">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-aac" title="Information technology — Generic coding of moving pictures and associated audio information — Part 7: Advanced Audio Coding (AAC)">[AAC]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①">decoder_config</a> structure SHALL comply with the constraints given in <a href="#aac-lc-specific">§ 3.11.2 AAC-LC Specific</a>.</p>
+     <p><code>mp4a</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑧">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑦">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-aac" title="Information technology — Generic coding of moving pictures and associated audio information — Part 7: Advanced Audio Coding (AAC)">[AAC]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①">decoder_config</a> structure SHALL comply with the constraints given in <a href="#aac-lc-specific">§ 3.11.2 AAC-LC Specific</a>.</p>
     <li data-md>
-     <p><code>fLaC</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑧">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑧">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config②">decoder_config</a> structure SHALL comply with the constraints given in <a href="#flac-specific">§ 3.11.3 FLAC Specific</a>.</p>
+     <p><code>fLaC</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑨">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑧">Audio Element</a>s with this codec configuration SHALL comply with the <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> specification and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config②">decoder_config</a> structure SHALL comply with the constraints given in <a href="#flac-specific">§ 3.11.3 FLAC Specific</a>.</p>
     <li data-md>
-     <p><code>ipcm</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③⑨">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑨">Audio Element</a>s with this codec configuration SHALL contain linear PCM (LPCM) audio samples and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config③">decoder_config</a> structure SHALL comply with the constraints given in <a href="#lpcm-specific">§ 3.11.4 LPCM Specific</a>.</p>
+     <p><code>ipcm</code>: All coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⓪">Audio Substream</a>s referred to by all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②⑨">Audio Element</a>s with this codec configuration SHALL contain linear PCM (LPCM) audio samples and the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config③">decoder_config</a> structure SHALL comply with the constraints given in <a href="#lpcm-specific">§ 3.11.4 LPCM Specific</a>.</p>
    </ul>
-   <p>Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu③">Codec Config OBU</a>s with an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①">codec_id</a>.</p>
+   <p>Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑤">Codec Config OBU</a>s with an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①">codec_id</a>.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> <code>ipcm</code> should not be confused with <code>lpcm</code>, which is another 4CC to identify codecs in other container formats (e.g., QuickTime).</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_per_frame">num_samples_per_frame</dfn> indicates the frame length, in samples, of the <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame">audio_frame()</a> provided in the audio_frame_obu. It SHALL NOT be set to zero. If the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config④">decoder_config</a> structure for a given codec specifies a value for the frame length, the two values SHALL be equal.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_roll_distance">audio_roll_distance</dfn> indicates how many audio frames prior to the current audio frame need to be decoded (and the decoded samples discarded) to set the decoder in a state that will produce the perfect decoded audio signal. It SHALL always be a negative value or zero. For some audio codecs, even if an audio frame can be decoded independently, the decoded signal after decoding only that frame may not represent a perfect, decoded audio signal, even ignoring compression artifacts. This can be due to overlap transforms. While potentially acceptable when starting to decode an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⓪">Audio Substream</a>, it may be problematic when automatically switching between similar <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④①">Audio Substream</a>s of different quality and/or bitrate.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_per_frame">num_samples_per_frame</dfn> indicates the frame length, in samples, of the <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame">audio_frame</a> provided in the audio_frame_obu. It SHALL NOT be set to zero. If the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config④">decoder_config</a> structure for a given codec specifies a value for the frame length, the two values SHALL be equal.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_roll_distance">audio_roll_distance</dfn> indicates how many audio frames prior to the current audio frame need to be decoded (and the decoded samples discarded) to set the decoder in a state that will produce the perfect decoded audio signal. It SHALL always be a negative value or zero. For some audio codecs, even if an audio frame can be decoded independently, the decoded signal after decoding only that frame may not represent a perfect, decoded audio signal, even ignoring compression artifacts. This can be due to overlap transforms. While potentially acceptable when starting to decode an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④①">Audio Substream</a>, it may be problematic when automatically switching between similar <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④②">Audio Substream</a>s of different quality and/or bitrate.</p>
    <ul>
     <li data-md>
      <p>It SHALL be set to \(-R\) when <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id②">codec_id</a> is set to <code>Opus</code>, where
@@ -2567,9 +2570,16 @@ <h3 class="heading settled" data-level="3.5" id="obu-codecconfig"><span class="s
     <li data-md>
      <p>It SHALL be set to 0 when <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id④">codec_id</a> is set to <code>fLaC</code> or <code>ipcm</code>.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="decoder_config">decoder_config</dfn> specifies the set of codec parameters required to decode the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④②">Audio Substream</a>. It is byte aligned.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="decoder_config">decoder_config</dfn> is an instance of the <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig">DecoderConfig()</a> class, which specifies the set of codec parameters required to decode the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④③">Audio Substream</a>. It is byte aligned.</p>
    <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="secno">3.6. </span><span class="content">Audio Element OBU Syntax and Semantics</span><a class="self-link" href="#obu-audioelement"></a></h3>
-   <p>This section specifies the OBU payload of the Audio Element OBU.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-element-obu">Audio Element OBU</dfn> provides information on how to combine one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④④">Audio Substream</a>s to reconstruct an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⓪">Audio Element</a>. This section specifies the payload format of the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①">Audio Element OBU</a>.</p>
+   <p>Additionally, the following parameter definitions are used in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②">Audio Element OBU</a>, and their syntax structures are specified in this section:</p>
+   <ul>
+    <li data-md>
+     <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixingparamdefinition">DemixingParamDefinition()</dfn> and <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="defaultdemixinginfoparameterdata">DefaultDemixingInfoParameterData()</dfn> provide the parameter definitions for demixing info, which is required for reconstructing a scalable channel audio representation.</p>
+    <li data-md>
+     <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recongainparamdefinition">ReconGainParamDefinition()</dfn> provides the parameter definition for recon gain, which is required for reconstructing a scalable channel audio representation.</p>
+   </ul>
    <p><b>Syntax</b></p>
 <pre>class AudioElementOBU() {
   leb128() audio_element_id;
@@ -2622,24 +2632,24 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
 
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-audio_element_id">audio_element_id</dfn> defines an identifier for an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⓪">Audio Element</a>. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑨">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id">audio_element_id</a> per <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③①">Audio Element</a>. There SHALL be exactly one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu">Audio Element OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⓪">Descriptors</a>. <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑨">Mix Presentation</a>s refer to a particular <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③②">Audio Element</a> using this identifier.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_element_type">audio_element_type</dfn> specifies the audio representation of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③③">Audio Element</a>, which is constructed from one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④③">Audio Substream</a>s. Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①">Audio Element OBU</a>s with a reserved <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type">audio_element_type</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-audio_element_id">audio_element_id</dfn> defines an identifier for an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③①">Audio Element</a>. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑨">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id">audio_element_id</a> per <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③②">Audio Element</a>. There SHALL be exactly one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③">Audio Element OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⓪">Descriptors</a>. <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑨">Mix Presentation</a>s refer to a particular <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③③">Audio Element</a> using this identifier.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_element_type">audio_element_type</dfn> specifies the audio representation of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③④">Audio Element</a>, which is constructed from one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑤">Audio Substream</a>s. Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu④">Audio Element OBU</a>s with a reserved <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type">audio_element_type</a>.</p>
 <pre class="def">audio_element_type: The type of audio representation.
    0    : CHANNEL_BASED
    1    : SCENE_BASED
   2~7   : Reserved
 </pre>
-   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-codec_config_id">codec_config_id</dfn> indicates the identifier for the codec configuration which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③④">Audio Element</a> refers to. Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②">Audio Element OBU</a>s with a <a data-link-type="dfn" href="#audio_element_obu-codec_config_id" id="ref-for-audio_element_obu-codec_config_id">codec_config_id</a> identifying an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑤">codec_id</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_substreams">num_substreams</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④④">Audio Substream</a>s that are used to reconstruct this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑤">Audio Element</a>. It SHALL NOT be set to 0.</p>
-   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-audio_substream_id">audio_substream_id</dfn> indicates the identifier for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑤">Audio Substream</a> which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑥">Audio Element</a> refers to.</p>
-   <p>Let a particular <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①③">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑥">Audio Substream</a>s be indexed as \(\left[c, n_c\right]\), where a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①④">Channel Group</a> format is described in <a href="#iamfgeneration-scalablechannelaudio-channelgroupformat">§ 10.2.6 Annex B-6: Channel Group Format (Normative)</a> and</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-codec_config_id">codec_config_id</dfn> indicates the identifier for the codec configuration which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑤">Audio Element</a> refers to. Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑤">Audio Element OBU</a>s with a <a data-link-type="dfn" href="#audio_element_obu-codec_config_id" id="ref-for-audio_element_obu-codec_config_id">codec_config_id</a> identifying an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑤">codec_id</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_substreams">num_substreams</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑥">Audio Substream</a>s that are used to reconstruct this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑥">Audio Element</a>. It SHALL NOT be set to 0.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="audio_element_obu" data-dfn-type="dfn" data-noexport id="audio_element_obu-audio_substream_id">audio_substream_id</dfn> indicates the identifier for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑦">Audio Substream</a> which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑦">Audio Element</a> refers to.</p>
+   <p>Let a particular <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①③">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑧">Audio Substream</a>s be indexed as \(\left[c, n_c\right]\), where a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①④">Channel Group</a> format is described in <a href="#iamfgeneration-scalablechannelaudio-channelgroupformat">§ 10.2.6 Annex B-6: Channel Group Format (Normative)</a> and</p>
    <ul>
     <li data-md>
      <p>\(c = \left[1, \ldots, C\right]\) is the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑤">Channel Group</a> index and \(C\) is the number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑥">Channel Group</a>s.</p>
     <li data-md>
-     <p>\(n_c = \left[1, \ldots, N_c\right]\) is the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑦">Audio Substream</a> index in the \(c\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑦">Channel Group</a> and \(N_c\) is the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑧">Audio Substream</a>s in the \(c\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑧">Channel Group</a>.</p>
+     <p>\(n_c = \left[1, \ldots, N_c\right]\) is the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑨">Audio Substream</a> index in the \(c\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑦">Channel Group</a> and \(N_c\) is the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⓪">Audio Substream</a>s in the \(c\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑧">Channel Group</a>.</p>
    </ul>
-   <p>Then, the i-th <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id">audio_substream_id</a> maps to a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑨">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑨">Audio Substream</a>s as follows, where i is the index of the array:</p>
+   <p>Then, the i-th <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id">audio_substream_id</a> maps to a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑨">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤①">Audio Substream</a>s as follows, where i is the index of the array:</p>
    <p>\[
 \left[
 \left[ 1, 1 \right],
@@ -2657,8 +2667,8 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
 \left[ C, N_c \right]
 \right]
 \]</p>
-   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⓪">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⓪">Channel Group</a> (i.e., the semantics of \(n_c\)) is specified in <a href="#syntax-scalable-channel-layout-config">§ 3.6.2 Scalable Channel Layout Config Syntax and Semantics</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_parameters">num_parameters</dfn> specifies the number of <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②①">Parameter Substream</a>s that are used by the algorithms specified in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑦">Audio Element</a>.</p>
+   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤②">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⓪">Channel Group</a> (i.e., the semantics of \(n_c\)) is specified in <a href="#syntax-scalable-channel-layout-config">§ 3.6.2 Scalable Channel Layout Config Syntax and Semantics</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_parameters">num_parameters</dfn> specifies the number of <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②①">Parameter Substream</a>s that are used by the algorithms specified in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑧">Audio Element</a>.</p>
    <ul>
     <li data-md>
      <p>When <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type①">audio_element_type</a> = 0, this field SHALL be set to 0, 1, or 2 for this version of the specification.</p>
@@ -2667,7 +2677,7 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
     <li data-md>
      <p>Parsers compliant with this version of the specification SHALL be able to parse any value of <a data-link-type="dfn" href="#num_parameters" id="ref-for-num_parameters">num_parameters</a>.</p>
    </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> For a given <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type③">audio_element_type</a>, a future version of the specification may define a new <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②②">Parameter Substream</a> which may be ignored by IA decoders compliant with this version of the specification. In that case, a new <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type">param_definition_type</a> will be defined in a future version of <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③">Audio Element OBU</a>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> For a given <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type③">audio_element_type</a>, a future version of the specification may define a new <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②②">Parameter Substream</a> which may be ignored by IA decoders compliant with this version of the specification. In that case, a new <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type">param_definition_type</a> will be defined in a future version of <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑥">Audio Element OBU</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_definition_type">param_definition_type</dfn> specifies the type of the parameter definition. All parameter definition types described in this version of the specification are listed in the table below, along with their associated parameter definitions.</p>
    <table class="def">
     <tbody>
@@ -2678,21 +2688,21 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
      <tr>
       <td>0
       <td>PARAMETER_DEFINITION_MIX_GAIN
-      <td>MixGainParamDefinition
+      <td><a data-link-type="dfn" href="#mixgainparamdefinition" id="ref-for-mixgainparamdefinition">MixGainParamDefinition()</a>
      <tr>
       <td>1
       <td>PARAMETER_DEFINITION_DEMIXING
-      <td>DemixingParamDefinition
+      <td><a data-link-type="dfn" href="#demixingparamdefinition" id="ref-for-demixingparamdefinition">DemixingParamDefinition()</a>
      <tr>
       <td>2
       <td>PARAMETER_DEFINITION_RECON_GAIN
-      <td>ReconGainParamDefinition
+      <td><a data-link-type="dfn" href="#recongainparamdefinition" id="ref-for-recongainparamdefinition">ReconGainParamDefinition()</a>
    </table>
    <ul>
     <li data-md>
-     <p>The type PARAMETER_DEFINITION_MIX_GAIN SHALL NOT be present in <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu④">Audio Element OBU</a>.</p>
+     <p>The type PARAMETER_DEFINITION_MIX_GAIN SHALL NOT be present in <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑦">Audio Element OBU</a>.</p>
     <li data-md>
-     <p>The type SHALL NOT be duplicated in one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑤">Audio Element OBU</a>.</p>
+     <p>The type SHALL NOT be duplicated in one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑧">Audio Element OBU</a>.</p>
     <li data-md>
      <p>When <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑥">codec_id</a> = <code>fLaC</code> or <code>ipcm</code>, the type PARAMETER_DEFINITION_RECON_GAIN SHALL NOT be present.</p>
     <li data-md>
@@ -2706,29 +2716,29 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
     <li data-md>
      <p>An OBU parser that is conformant with this version of the specification SHALL be able to parse <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type①">param_definition_type</a> = P (where P > 2) and <a data-link-type="dfn" href="#param_definition_size" id="ref-for-param_definition_size">param_definition_size</a>. The OBU Parser SHOULD ignore the bytes indicated by <a data-link-type="dfn" href="#param_definition_size" id="ref-for-param_definition_size①">param_definition_size</a>.</p>
    </ul>
-   <p><dfn data-dfn-type="dfn" data-noexport id="demixing_info">demixing_info<a class="self-link" href="#demixing_info"></a></dfn> provides the parameter definition for the demixing information, which is used to reconstruct a scalable channel audio representation. The parameter definition is provided by DemixingParamDefinition() and the corresponding parameter data to be provided in parameter blocks is specified in <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data">demixing_info_parameter_data</a>.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="demixing_info">demixing_info<a class="self-link" href="#demixing_info"></a></dfn> is an instance of the <a data-link-type="dfn" href="#demixingparamdefinition" id="ref-for-demixingparamdefinition①">DemixingParamDefinition()</a> class, which provides the parameter definition for the demixing information, which is used to reconstruct a scalable channel audio representation. The corresponding parameter data to be provided in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①②">Parameter Block OBU</a>s with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id">parameter_id</a> is specified in the <a data-link-type="dfn" href="#demixinginfoparameterdata" id="ref-for-demixinginfoparameterdata">DemixingInfoParameterData()</a> class.</p>
    <p>In this parameter definition,</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate">parameter_rate</a> SHALL be set to the sample rate of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑧">Audio Element</a>.</p>
+     <p><a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate">parameter_rate</a> SHALL be set to the sample rate of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑨">Audio Element</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode">param_definition_mode</a> SHALL be set to 0.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration">duration</a> SHALL be the same as <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame③">num_samples_per_frame</a> of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③⑨">Audio Element</a>.</p>
+     <p><a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration">duration</a> SHALL be the same as <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame③">num_samples_per_frame</a> of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⓪">Audio Element</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks">num_subblocks</a> SHALL be set to 1.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration">constant_subblock_duration</a> SHALL be the same as <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration①">duration</a>.</p>
    </ul>
-   <p><dfn data-dfn-type="dfn" data-noexport id="recon_gain_info">recon_gain_info<a class="self-link" href="#recon_gain_info"></a></dfn> provides the parameter definition for the gain value, which is used to reconstruct a scalable channel audio representation. The parameter definition is provided by ReconGainParamDefinition() and the corresponding parameter data to be provided in parameter blocks is specified in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data">recon_gain_info_parameter_data</a>.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="recon_gain_info">recon_gain_info<a class="self-link" href="#recon_gain_info"></a></dfn> is an instance of the <a data-link-type="dfn" href="#recongainparamdefinition" id="ref-for-recongainparamdefinition①">ReconGainParamDefinition()</a> class, which provides the parameter definition for the gain value, which is used to reconstruct a scalable channel audio representation. The corresponding parameter data to be provided in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①③">Parameter Block OBU</a>s with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①">parameter_id</a> is specified in the <a data-link-type="dfn" href="#recongaininfoparameterdata" id="ref-for-recongaininfoparameterdata">ReconGainInfoParameterData()</a> class.</p>
    <p>In this parameter definition,</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate①">parameter_rate</a> SHALL be set to the sample rate of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⓪">Audio Element</a>.</p>
+     <p><a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate①">parameter_rate</a> SHALL be set to the sample rate of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④①">Audio Element</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode①">param_definition_mode</a> SHALL be set to 0.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration②">duration</a> SHALL be the same as <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame④">num_samples_per_frame</a> of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④①">Audio Element</a>.</p>
+     <p><a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration②">duration</a> SHALL be the same as <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame④">num_samples_per_frame</a> of this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④②">Audio Element</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks①">num_subblocks</a> SHALL be set to 1.</p>
     <li data-md>
@@ -2736,14 +2746,14 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
    </ul>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_definition_size">param_definition_size</dfn> indicates the size in bytes of <a data-link-type="dfn" href="#param_definition_bytes" id="ref-for-param_definition_bytes">param_definition_bytes</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_definition_bytes">param_definition_bytes</dfn> represents reserved bytes for future use when new <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type②">param_definition_type</a> values are defined. Parsers compliant with this version of the specification SHOULD ignore these bytes.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="scalable_channel_layout_config">scalable_channel_layout_config</dfn> provides the metadata required for combining the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤①">Audio Substream</a>s referred to here in order to reconstruct a scalable channel layout.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ambisonics_config">ambisonics_config</dfn> provides the metadata required for combining the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤②">Audio Substream</a>s referred to here in order to reconstruct an Ambisonics layout.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="scalable_channel_layout_config">scalable_channel_layout_config</dfn> is an instance of the <a data-link-type="dfn" href="#scalablechannellayoutconfig" id="ref-for-scalablechannellayoutconfig">ScalableChannelLayoutConfig()</a> class, which provides the metadata required for combining the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤③">Audio Substream</a>s referred to here in order to reconstruct a scalable channel layout.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ambisonics_config">ambisonics_config</dfn> is an instance of the <a data-link-type="dfn" href="#ambisonicsconfig" id="ref-for-ambisonicsconfig">AmbisonicsConfig()</a> class, which provides the metadata required for combining the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤④">Audio Substream</a>s referred to here in order to reconstruct an Ambisonics layout.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="audio_element_config_size">audio_element_config_size<a class="self-link" href="#audio_element_config_size"></a></dfn> indicates the size in bytes of <a data-link-type="dfn" href="#audio_element_config_bytes" id="ref-for-audio_element_config_bytes">audio_element_config_bytes</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_element_config_bytes">audio_element_config_bytes</dfn> represents reserved bytes for future use when new <a data-link-type="dfn" href="#audio_element_type" id="ref-for-audio_element_type④">audio_element_type</a> values are defined. Parsers compliant with this version of the specification SHOULD ignore these bytes.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="default_demixing_info_parameter_data">default_demixing_info_parameter_data</dfn> provides the default demixing parameter data to apply to all audio samples when there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⓪">Parameter Block OBU</a>s (with the same <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id">parameter_id</a> defined in this DemixingParamDefinition()) provided.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="default_demixing_info_parameter_data">default_demixing_info_parameter_data</dfn> is an instance of the <a data-link-type="dfn" href="#defaultdemixinginfoparameterdata" id="ref-for-defaultdemixinginfoparameterdata">DefaultDemixingInfoParameterData()</a> class, which provides the default demixing parameter data to apply to all audio samples when there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①④">Parameter Block OBU</a>s (with the same <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id">parameter_id</a> defined in this <a data-link-type="dfn" href="#demixingparamdefinition" id="ref-for-demixingparamdefinition②">DemixingParamDefinition()</a>) provided.</p>
    <ul>
     <li data-md>
-     <p>In this class, <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset">w_idx_offset</a> in <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data①">demixing_info_parameter_data</a> SHALL be ignored.</p>
+     <p>In this class, <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset">w_idx_offset</a> in <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data">demixing_info_parameter_data</a> SHALL be ignored.</p>
     <li data-md>
      <p>Instead, <a data-link-type="dfn" href="#default_w" id="ref-for-default_w">default_w</a> directly indicates the weight value <a data-link-type="dfn" href="#w-k" id="ref-for-w-k">\(w(k)\)</a>.</p>
    </ul>
@@ -2763,7 +2773,7 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
    10     :  0.5
 11 ~ 15   :  reserved
 </pre>
-   <p>A default recon gain value of 0 dB is implied when there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①①">Parameter Block OBU</a>s (with the same <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id①">parameter_id</a> defined in this ReconGainParamDefinition()) provided.</p>
+   <p>A default recon gain value of 0 dB is implied when there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑤">Parameter Block OBU</a>s (with the same <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id①">parameter_id</a> defined in this <a data-link-type="dfn" href="#recongainparamdefinition" id="ref-for-recongainparamdefinition②">ReconGainParamDefinition()</a>) provided.</p>
    <h4 class="heading settled" data-level="3.6.1" id="parameter-definition"><span class="secno">3.6.1. </span><span class="content">Parameter Definition Syntax and Semantics</span><a class="self-link" href="#parameter-definition"></a></h4>
    <p>Parameter definition classes inherit from the abstract <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="paramdefinition">ParamDefinition()</dfn> class.</p>
    <p><b>Syntax</b></p>
@@ -2793,14 +2803,14 @@ <h4 class="heading settled" data-level="3.6.1" id="parameter-definition"><span c
 \[\frac{\text{parameter_rate} \times \text{num_samples_per_frame}}{\text{Audio Element sample rate}},\]
 is a non-zero integer.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_definition_mode">param_definition_mode</dfn> indicates whether this parameter definition specifies the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration④">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks②">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration②">constant_subblock_duration</a> and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration">subblock_duration</a> fields for the parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id">parameter_id</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_definition_mode">param_definition_mode</dfn> indicates whether this parameter definition specifies the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration④">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks②">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration②">constant_subblock_duration</a> and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration">subblock_duration</a> fields for the parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id②">parameter_id</a>.</p>
    <ul>
     <li data-md>
-     <p>When this field is set to 0, all of the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑤">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks③">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration③">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration①">subblock_duration</a> fields SHALL be specified in this parameter definition. None of the parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①">parameter_id</a> SHALL specify these same fields.</p>
+     <p>When this field is set to 0, all of the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑤">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks③">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration③">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration①">subblock_duration</a> fields SHALL be specified in this parameter definition. None of the parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id③">parameter_id</a> SHALL specify these same fields.</p>
     <li data-md>
-     <p>When this field is set to 1, none of the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑥">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks④">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration④">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration②">subblock_duration</a> fields SHALL be specified in this parameter definition. Instead, each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id②">parameter_id</a> SHALL specify these same fields.</p>
+     <p>When this field is set to 1, none of the <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑥">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks④">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration④">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration②">subblock_duration</a> fields SHALL be specified in this parameter definition. Instead, each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id④">parameter_id</a> SHALL specify these same fields.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-duration">duration</dfn> specifies the duration for which each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id③">parameter_id</a> is valid and applicable. It SHALL NOT be set to 0.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-duration">duration</dfn> specifies the duration for which each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑤">parameter_id</a> is valid and applicable. It SHALL NOT be set to 0.</p>
    <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-constant_subblock_duration">constant_subblock_duration</dfn> specifies the duration of each subblock, in the case where all subblocks except the last subblock have equal durations. If all subblocks except the last subblock do not have equal durations, the value of <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑤">constant_subblock_duration</a> SHALL be set to 0.</p>
    <p>When <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑥">constant_subblock_duration</a> is not equal to 0,</p>
    <ul>
@@ -2812,11 +2822,13 @@ <h4 class="heading settled" data-level="3.6.1" id="parameter-definition"><span c
 		\[ \text{duration} - \left( \text{num_subblocks} - 1 \right) \times \text{constant_subblock_duration}. \]</p>
    </ul>
    <p>When <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑦">constant_subblock_duration</a> is equal to 0, the summation of all <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration③">subblock_duration</a> in this parameter block SHALL be equal to <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑦">duration</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-num_subblocks">num_subblocks</dfn> specifies the number of different sets of parameter values specified in each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id④">parameter_id</a>, where each set describes a different subblock of the timeline, contiguously.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-num_subblocks">num_subblocks</dfn> specifies the number of different sets of parameter values specified in each parameter block with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑥">parameter_id</a>, where each set describes a different subblock of the timeline, contiguously.</p>
    <p><dfn class="dfn-paneled" data-dfn-for="ParamDefinition" data-dfn-type="dfn" data-noexport id="paramdefinition-subblock_duration">subblock_duration</dfn> specifies the duration for the given subblock. It SHALL NOT be set to 0.</p>
    <p>The values for <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑧">duration</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑧">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration④">subblock_duration</a> SHALL be expressed as the number of ticks at the <a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate②">parameter_rate</a> specified in the corresponding parameter definition.</p>
    <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layout-config"><span class="secno">3.6.2. </span><span class="content">Scalable Channel Layout Config Syntax and Semantics</span><a class="self-link" href="#syntax-scalable-channel-layout-config"></a></h4>
-   <p><a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config">scalable_channel_layout_config</a> provides the configuration for a given scalable channel audio representation.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="scalablechannellayoutconfig">ScalableChannelLayoutConfig()</dfn> class provides the configuration for a given scalable channel audio representation.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channelaudiolayerconfig">ChannelAudioLayerConfig()</dfn> class provides the configuration for a specific <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②①">Channel Group</a>.</p>
+   <p>This section specifies the syntax structures of the <a data-link-type="dfn" href="#scalablechannellayoutconfig" id="ref-for-scalablechannellayoutconfig①">ScalableChannelLayoutConfig()</a> and <a data-link-type="dfn" href="#channelaudiolayerconfig" id="ref-for-channelaudiolayerconfig">ChannelAudioLayerConfig()</a> classes.</p>
    <p><b>Syntax</b></p>
 <pre>class ScalableChannelLayoutConfig() {
   unsigned int (3) num_layers;
@@ -2840,22 +2852,22 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
   }
 }
 </pre>
-   <p>When an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④②">Audio Element</a> is composed of \(G(r)\) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤③">Audio Substream</a>s, its scalable channel audio representation is layered into \(r\) <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers④">num_layers</a> of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②①">Channel Group</a>s.</p>
+   <p>When an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④③">Audio Element</a> is composed of \(G(r)\) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑤">Audio Substream</a>s, its scalable channel audio representation is layered into \(r\) <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers④">num_layers</a> of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②②">Channel Group</a>s.</p>
    <ul>
     <li data-md>
-     <p>The order of the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②②">Channel Group</a>s in each <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②">Temporal Unit</a> SHALL be same as the order of the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config">channel_audio_layer_config</a>s in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config①">scalable_channel_layout_config</a>.</p>
+     <p>The order of the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②③">Channel Group</a>s in each <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②">Temporal Unit</a> SHALL be same as the order of the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config">channel_audio_layer_config</a>s in <a data-link-type="dfn" href="#scalablechannellayoutconfig" id="ref-for-scalablechannellayoutconfig②">ScalableChannelLayoutConfig()</a>.</p>
     <li data-md>
-     <p>The \(q\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②③">Channel Group</a> consists of \(G(q) - G(q - 1)\) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤④">Audio Substream</a>s, where \(q = 1, 2, \ldots, r\) and \(G(0) = 0\).</p>
+     <p>The \(q\)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②④">Channel Group</a> consists of \(G(q) - G(q - 1)\) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑥">Audio Substream</a>s, where \(q = 1, 2, \ldots, r\) and \(G(0) = 0\).</p>
     <li data-md>
-     <p>Let the term "Audio Frames" mean the set of all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②②">Audio Frame OBU</a>s (for this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④③">Audio Element</a>) that have the same start timestamp. All Audio Frames in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⓪">IA Sequence</a> SHALL have the same number of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②③">Audio Frame OBU</a>s.</p>
+     <p>Let the term "Audio Frames" mean the set of all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②④">Audio Frame OBU</a>s (for this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④④">Audio Element</a>) that have the same start timestamp. All Audio Frames in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⓪">IA Sequence</a> SHALL have the same number of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑤">Audio Frame OBU</a>s.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①②">Parameter Block OBU</a>s MAY be associated with Audio Frames.</p>
+     <p><a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑥">Parameter Block OBU</a>s MAY be associated with Audio Frames.</p>
    </ul>
    <center><img height="356" src="images/Immersive Audio Sequence with scalable channel audio (before OBU packing).png" style="width:100%; height:auto;" width="1622"></center>
    <center>
     <figcaption>Immersive Audio Sequence with scalable channel audio (before OBU packing). See <a href="#standalone">§ 5 Standalone IAMF Representation</a> for related details on OBU ordering within an IA Sequence.</figcaption>
    </center>
-   <p>Each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②④">Channel Group</a> (or scalable audio channel layer) is associated with a different <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout③">loudspeaker_layout</a>. The IA decoder SHALL select one of the layers according to the following rules, in order:</p>
+   <p>Each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑤">Channel Group</a> (or scalable audio channel layer) is associated with a different <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout③">loudspeaker_layout</a>. The IA decoder SHALL select one of the layers according to the following rules, in order:</p>
    <ul>
     <li data-md>
      <p>The IA decoder SHOULD first attempt to select the layer with a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout④">loudspeaker_layout</a> that matches the physical playback layout.</p>
@@ -2863,13 +2875,13 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
      <p>If there is no match, the IA decoder SHOULD select the layer with the closest <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑤">loudspeaker_layout</a> to the physical layout and then apply up- or down-mixing appropriately, after decoding and reconstruction of the channel audio. Sections <a href="#iamfgeneration-scalablechannelaudio-downmixmechanism">§ 10.2.2 Annex B-2: Down-mix Mechanism (Informative)</a> and <a href="#processing-downmixmatrix">§ 7.6 Down-mix Matrix (Informative)</a> provide examples of dynamic and static down-mixing matrices for some common layouts that MAY be used.</p>
    </ul>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_layers">num_layers</dfn> indicates the number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑤">Channel Group</a>s for scalable channel audio. It SHALL NOT be set to zero and its maximum value SHALL be 6.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_layers">num_layers</dfn> indicates the number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑥">Channel Group</a>s for scalable channel audio. It SHALL NOT be set to zero and its maximum value SHALL be 6.</p>
    <ul>
     <li data-md>
      <p>If <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑥">loudspeaker_layout</a> is set to Binaural, this field SHALL be set to 1.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_audio_layer_config">channel_audio_layer_config</dfn> provides the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑥">Channel Group</a>'s configuration, where i is the layer index provided as input argument to this instance of the ChannelAudioLayerConfig class.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudspeaker_layout">loudspeaker_layout</dfn> indicates the channel layout to be reconstructed from the precedent <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑦">Channel Group</a>s and current <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑧">Channel Group</a>. When a reserved value for <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑦">loudspeaker_layout</a> is used, parsers compliant with this version of the specification SHOULD skip the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config①">channel_audio_layer_config</a> for that layer and all subsequent ones, if any.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_audio_layer_config">channel_audio_layer_config</dfn> is an instance of the <a data-link-type="dfn" href="#channelaudiolayerconfig" id="ref-for-channelaudiolayerconfig①">ChannelAudioLayerConfig()</a> class, which provides the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑦">Channel Group</a>'s configuration, where i is the layer index provided as input argument to this instance of the <a data-link-type="dfn" href="#channelaudiolayerconfig" id="ref-for-channelaudiolayerconfig②">ChannelAudioLayerConfig()</a> class.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudspeaker_layout">loudspeaker_layout</dfn> indicates the channel layout to be reconstructed from the precedent <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑧">Channel Group</a>s and current <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑨">Channel Group</a>. When a reserved value for <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑦">loudspeaker_layout</a> is used, parsers compliant with this version of the specification SHOULD skip the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config①">channel_audio_layer_config</a> for that layer and all subsequent ones, if any.</p>
    <p>In this version of the specification, <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑧">loudspeaker_layout</a> indicates one of the 10 channel layouts listed below.</p>
    <table class="def">
     <tbody>
@@ -2944,30 +2956,30 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
      <p>Examples for NOT RECOMMENDED list of channel layouts: 2ch/3.1.2ch/5.1.2ch, 2ch/3.1.2ch/5.1.2ch/7.1.4ch, 2ch/5.1.2ch/7.1.4ch, 2ch/7.1.4ch, etc.</p>
    </ul>
    <p class="note" role="note"><span class="marker">NOTE:</span> This specification allows down-mixing mechanisms (e.g., as specified in <a href="#iamfgeneration-scalablechannelaudio-downmixmechanism">§ 10.2.2 Annex B-2: Down-mix Mechanism (Informative)</a>) to drop the height channel if the output layout has no height channels. An example is down-mixing from 7.1.4ch to Mono, Stereo, 5.1ch or 7.1ch. Therefore, given an input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⓪">3D audio signal</a> with height channels, an encoder may generate a set of scalable audio channel groups with layouts that do not have height channels.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_gain_is_present_flag">output_gain_is_present_flag</dfn> indicates if the output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑨">Channel Group</a> are present.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_gain_is_present_flag">output_gain_is_present_flag</dfn> indicates if the output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⓪">Channel Group</a> are present.</p>
    <ul>
     <li data-md>
-     <p>0: No output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⓪">Channel Group</a> are present.</p>
+     <p>0: No output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③①">Channel Group</a> are present.</p>
     <li data-md>
-     <p>1: output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③①">Channel Group</a> are present. In this case, <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags">output_gain_flags</a> and <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain">output_gain</a> fields are present.</p>
+     <p>1: output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③②">Channel Group</a> are present. In this case, <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags">output_gain_flags</a> and <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain">output_gain</a> fields are present.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_is_present_flag">recon_gain_is_present_flag</dfn> indicates if the recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③②">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data①">recon_gain_info_parameter_data</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_is_present_flag">recon_gain_is_present_flag</dfn> indicates if the recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③③">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data">recon_gain_info_parameter_data</a>.</p>
    <ul>
     <li data-md>
-     <p>0: No recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③③">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data②">recon_gain_info_parameter_data</a>.</p>
+     <p>0: No recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③④">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data①">recon_gain_info_parameter_data</a>.</p>
     <li data-md>
-     <p>1: recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③④">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data③">recon_gain_info_parameter_data</a>. In this case, the <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags">recon_gain_flags</a> and <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain">recon_gain</a> fields are present.</p>
+     <p>1: recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑤">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data②">recon_gain_info_parameter_data</a>. In this case, the <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags">recon_gain_flags</a> and <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain">recon_gain</a> fields are present.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="substream_count">substream_count</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑤">Audio Substream</a>s. The sum of all <a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count">substream_count</a>s in this OBU SHALL be the same as <a data-link-type="dfn" href="#num_substreams" id="ref-for-num_substreams">num_substreams</a> in this OBU. It SHALL NOT be set to 0.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="coupled_substream_count">coupled_substream_count</dfn> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑥">Audio Substream</a>s, each of which is coded as coupled stereo channels.</p>
-   <p>Each pair of <a data-link-type="dfn" href="#coupled-stereo-channels" id="ref-for-coupled-stereo-channels">coupled stereo channels</a> in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑤">Channel Group</a> SHALL be coded in stereo mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑦">Audio Substream</a>, also referred to as a coupled substream. Each <a data-link-type="dfn" href="#non-coupled-channels" id="ref-for-non-coupled-channels">non-coupled channel</a> in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑥">Channel Group</a> SHALL be coded in mono mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑧">Audio Substream</a>, also known as a non-coupled substream.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="substream_count">substream_count</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑦">Audio Substream</a>s. The sum of all <a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count">substream_count</a>s in this OBU SHALL be the same as <a data-link-type="dfn" href="#num_substreams" id="ref-for-num_substreams">num_substreams</a> in this OBU. It SHALL NOT be set to 0.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="coupled_substream_count">coupled_substream_count</dfn> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑧">Audio Substream</a>s, each of which is coded as coupled stereo channels.</p>
+   <p>Each pair of <a data-link-type="dfn" href="#coupled-stereo-channels" id="ref-for-coupled-stereo-channels">coupled stereo channels</a> in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑥">Channel Group</a> SHALL be coded in stereo mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑨">Audio Substream</a>, also referred to as a coupled substream. Each <a data-link-type="dfn" href="#non-coupled-channels" id="ref-for-non-coupled-channels">non-coupled channel</a> in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑦">Channel Group</a> SHALL be coded in mono mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⓪">Audio Substream</a>, also known as a non-coupled substream.</p>
    <ul>
     <li data-md>
      <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="coupled-stereo-channels">Coupled stereo channels</dfn>: L/R, Ls/Rs, Lss/Rss, Lrs/Rrs, Ltf/Rtf, Ltb/Rtb</p>
     <li data-md>
      <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="non-coupled-channels">Non-coupled channels</dfn>: C, LFE, L</p>
    </ul>
-   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑨">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑦">Channel Group</a> SHALL be as follows:</p>
+   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥①">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑧">Channel Group</a> SHALL be as follows:</p>
    <ul>
     <li data-md>
      <p>Coupled substreams come first and are followed by non-coupled substreams.</p>
@@ -2992,7 +3004,8 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
 </pre>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_gain">output_gain</dfn> indicates the gain value to be applied to the mixed channels which are indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags①">output_gain_flags</a>, where each mixed channel is generated by down-mixing two or more input channels. It is computed as \(20 \times \log_{10}(f)\), where \(f\) is the factor by which to scale the mixed channels. It is stored as a 16-bit, signed, two’s complement fixed-point value with 8 fractional bits (i.e., Q7.8)(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
    <h4 class="heading settled" data-level="3.6.3" id="syntax-ambisonics-config"><span class="secno">3.6.3. </span><span class="content">Ambisonics Config Syntax and Semantics</span><a class="self-link" href="#syntax-ambisonics-config"></a></h4>
-   <p><a data-link-type="dfn" href="#ambisonics_config" id="ref-for-ambisonics_config">ambisonics_config</a> provides the configuration for a given Ambisonics representation. In this specification, the <a data-link-type="biblio" href="#biblio-ambix" title="AMBIX - A SUGGESTED AMBISONICS FORMAT">[AmbiX]</a> format is adopted, which uses Ambisonics Channel Number (ACN) channel ordering and normalizes the channels with Schmidt Semi-Normalization (SN3D).</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ambisonicsconfig">AmbisonicsConfig()</dfn> class provides the configuration for a given Ambisonics representation. This section specifies the syntax structure of the <a data-link-type="dfn" href="#ambisonicsconfig" id="ref-for-ambisonicsconfig①">AmbisonicsConfig()</a> class.</p>
+   <p>In this specification, the <a data-link-type="biblio" href="#biblio-ambix" title="AMBIX - A SUGGESTED AMBISONICS FORMAT">[AmbiX]</a> format is adopted, which uses Ambisonics Channel Number (ACN) channel ordering and normalizes the channels with Schmidt Semi-Normalization (SN3D).</p>
    <p><b>Syntax</b></p>
 <pre>class AmbisonicsConfig() {
   leb128() ambisonics_mode;
@@ -3022,25 +3035,24 @@ <h4 class="heading settled" data-level="3.6.3" id="syntax-ambisonics-config"><sp
    0    : MONO
    1    : PROJECTION
 </pre>
-   <p>If ambisonics_mode is equal to MONO, this indicates that the Ambisonics channels are coded as individual mono <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⓪">Audio Substream</a>s. For LPCM, <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode">ambisonics_mode</a> SHALL be equal to MONO.</p>
-   <p>If ambisonics_mode is equal to PROJECTION, this indicates that the Ambisonics channels are first linearly projected onto another subspace before coding as a mix of coupled stereo and mono <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥①">Audio Substream</a>s.</p>
+   <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode">ambisonics_mode</a> is equal to MONO, this indicates that the Ambisonics channels are coded as individual mono <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥②">Audio Substream</a>s. For LPCM, <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode①">ambisonics_mode</a> SHALL be equal to MONO.</p>
+   <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode②">ambisonics_mode</a> is equal to PROJECTION, this indicates that the Ambisonics channels are first linearly projected onto another subspace before coding as a mix of coupled stereo and mono <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥③">Audio Substream</a>s.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_channel_count">output_channel_count</dfn> complies with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something⑥">channel count</a> in <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a> with the following restrictions:</p>
    <ul>
     <li data-md>
      <p>The allowed numbers of <a data-link-type="dfn" href="#output_channel_count" id="ref-for-output_channel_count">output_channel_count</a> are \(\left( 1 + n \right)^2\), for \(n = 0, 1, 2, \ldots, 14\).</p>
     <li data-md>
-     <p>In other words, a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④④">Audio Element</a> SHALL NOT include non-diegetic channels.</p>
+     <p>In other words, a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑤">Audio Element</a> SHALL NOT include non-diegetic channels.</p>
    </ul>
-   <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count①">substream_count</a> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥②">Audio Substream</a>s. It SHALL be the same as <a data-link-type="dfn" href="#num_substreams" id="ref-for-num_substreams①">num_substreams</a> in this OBU.</p>
+   <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count①">substream_count</a> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥④">Audio Substream</a>s. It SHALL be the same as <a data-link-type="dfn" href="#num_substreams" id="ref-for-num_substreams①">num_substreams</a> in this OBU.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_mapping">channel_mapping</dfn> complies with the "Channel Mapping" field for <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something⑦">ChannelMappingFamily</a> = 2 in <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a>.</p>
-   <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count">coupled_substream_count</a> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥③">Audio Substream</a>s that are coded as coupled stereo channels, where \(\text{M} \le \text{N}\).</p>
+   <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count">coupled_substream_count</a> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑤">Audio Substream</a>s that are coded as coupled stereo channels, where \(\text{M} \le \text{N}\).</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixing_matrix">demixing_matrix</dfn> complies with the "Demixing Matrix" field for <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something⑧">ChannelMappingFamily</a> = 3 in <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a> except that the byte order of each of the matrix coefficients is converted to big-endian.</p>
-   <p>A scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑤">Audio Element</a> has only one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑧">Channel Group</a>, which includes all <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥④">Audio Substream</a>s that it refers to. The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑤">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑨">Channel Group</a> SHALL conform to <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a>.</p>
+   <p>A scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑥">Audio Element</a> has only one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑨">Channel Group</a>, which includes all <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑥">Audio Substream</a>s that it refers to. The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑦">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⓪">Channel Group</a> SHALL conform to <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a>.</p>
    <h3 class="heading settled" data-level="3.7" id="obu-mixpresentation"><span class="secno">3.7. </span><span class="content">Mix Presentation OBU Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation"></a></h3>
-   <p>This section specifies the OBU payload of the Mix Presentation OBU.</p>
-   <p>The metadata in mix_presentation_obu specifies how to render, process and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑥">Audio Element</a>s, with details provided in <a href="#processing-mixpresentation">§ 7.3 Mix Presentation</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation-obu">Mix Presentation OBU</dfn> provides information on how to render and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑦">Audio Element</a>s to generate the final Immersive Audio output, with details provided in <a href="#processing-mixpresentation">§ 7.3 Mix Presentation</a>. This section specifies the payload format of the <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①">Mix Presentation OBU</a>.</p>
    <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③①">IA Sequence</a> MAY have one or more <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⓪">Mix Presentation</a>s specified. The IA parser SHALL select the appropriate <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①①">Mix Presentation</a> to process according to the rules specified in <a href="#processing-mixpresentation-selection">§ 7.3.1 Selecting a Mix Presentation</a>.</p>
-   <p>A <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①②">Mix Presentation</a> MAY contain one or more sub-mixes. Common use cases MAY specify only one sub-mix, which includes all rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑦">Audio Element</a>s used in the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①③">Mix Presentation</a>. The use-case for specifying more than one sub-mix arises if an IA multiplexer is merging two or more <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③②">IA Sequence</a>s. In this case, it MAY choose to capture the loudness information from the original <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③③">IA Sequence</a>s in multiple sub-mixes, instead of recomputing the loudness information for the final mix.</p>
+   <p>A <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①②">Mix Presentation</a> MAY contain one or more sub-mixes. Common use cases MAY specify only one sub-mix, which includes all rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑧">Audio Element</a>s used in the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①③">Mix Presentation</a>. The use-case for specifying more than one sub-mix arises if an IA multiplexer is merging two or more <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③②">IA Sequence</a>s. In this case, it MAY choose to capture the loudness information from the original <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③③">IA Sequence</a>s in multiple sub-mixes, instead of recomputing the loudness information for the final mix.</p>
    <p><b>Syntax</b></p>
 <pre>class MixPresentationOBU() {
   leb128() mix_presentation_id;
@@ -3074,25 +3086,25 @@ <h3 class="heading settled" data-level="3.7" id="obu-mixpresentation"><span clas
 }  
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_id">mix_presentation_id</dfn> defines an identifier for a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①④">Mix Presentation</a>. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③④">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#mix_presentation_id" id="ref-for-mix_presentation_id">mix_presentation_id</a> per <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑤">Mix Presentation</a>. There SHALL be exactly one <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu">Mix Presentation OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①①">Descriptors</a>. This identifier MAY be used by the application to select which <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑥">Mix Presentation</a>(s) to offer.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_id">mix_presentation_id</dfn> defines an identifier for a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①④">Mix Presentation</a>. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③④">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#mix_presentation_id" id="ref-for-mix_presentation_id">mix_presentation_id</a> per <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑤">Mix Presentation</a>. There SHALL be exactly one <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②">Mix Presentation OBU</a> with a given identifier in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①①">Descriptors</a>. This identifier MAY be used by the application to select which <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑥">Mix Presentation</a>(s) to offer.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="count_label">count_label</dfn> indicates the number of labels in different languages.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="language_label">language_label</dfn> specifies the language which both <a data-link-type="dfn" href="#mix_presentation_friendly_label" id="ref-for-mix_presentation_friendly_label">mix_presentation_friendly_label</a> and <a data-link-type="dfn" href="#audio_element_friendly_label" id="ref-for-audio_element_friendly_label">audio_element_friendly_label</a> are written in. It SHALL conform to <a data-link-type="biblio" href="#biblio-bcp-47" title="BCP 47">[BCP-47]</a>. The same language SHALL NOT be duplicated in this loop.</p>
    <ul>
     <li data-md>
      <p>The labels in the i-th <a data-link-type="dfn" href="#mix_presentation_annotations" id="ref-for-mix_presentation_annotations">mix_presentation_annotations</a> and <a data-link-type="dfn" href="#mix_presentation_element_annotations" id="ref-for-mix_presentation_element_annotations">mix_presentation_element_annotations</a> SHALL be written in the language indicated by the i-th <a data-link-type="dfn" href="#language_label" id="ref-for-language_label">language_label</a>, where i = 0, 1, ..., <a data-link-type="dfn" href="#count_label" id="ref-for-count_label">count_label</a> -1.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_annotations">mix_presentation_annotations</dfn> provides informational metadata that an IA parser SHOULD refer to when selecting the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑦">Mix Presentation</a> to use. The metadata MAY also be used by the playback system to display information to the user but is not used in the rendering or mixing process to generate the final output audio signal.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_annotations">mix_presentation_annotations</dfn> is an instance of the <a data-link-type="dfn" href="#mixpresentationannotations" id="ref-for-mixpresentationannotations">MixPresentationAnnotations()</a> class, which provides informational metadata that an IA parser SHOULD refer to when selecting the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑦">Mix Presentation</a> to use. The metadata MAY also be used by the playback system to display information to the user but is not used in the rendering or mixing process to generate the final output audio signal.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_sub_mixes">num_sub_mixes</dfn> specifies the number of sub-mixes. It SHALL NOT be set to 0.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_audio_elements">num_audio_elements</dfn> specifies the number of <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑧">Audio Element</a>s that are used in this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑧">Mix Presentation</a> to generate the final output audio signal for playback. It SHALL NOT be set to 0.</p>
-   <p><dfn class="dfn-paneled" data-dfn-for="mix_presentation_obu" data-dfn-type="dfn" data-noexport id="mix_presentation_obu-audio_element_id">audio_element_id</dfn> indicates the identifier for an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑨">Audio Element</a> which this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑨">Mix Presentation</a> refers to.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_element_annotations">mix_presentation_element_annotations</dfn> provides informational metadata that the playback system MAY use to display information to the user. It is not used in the rendering or mixing process to generate the final output audio signal.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rendering_config">rendering_config</dfn> provides the metadata required for rendering the referenced <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⓪">Audio Element</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="element_mix_config">element_mix_config</dfn> provides the metadata required for applying any processing to the referenced and rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤①">Audio Element</a> before being summed with other processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤②">Audio Element</a>s.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_mix_config">output_mix_config</dfn> provides the metadata required for post-processing the mixed audio signal to generate the audio signal for playback.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_audio_elements">num_audio_elements</dfn> specifies the number of <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⑨">Audio Element</a>s that are used in this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑧">Mix Presentation</a> to generate the final output audio signal for playback. It SHALL NOT be set to 0.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="mix_presentation_obu" data-dfn-type="dfn" data-noexport id="mix_presentation_obu-audio_element_id">audio_element_id</dfn> indicates the identifier for an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⓪">Audio Element</a> which this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①⑨">Mix Presentation</a> refers to.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_element_annotations">mix_presentation_element_annotations</dfn> is an instance of the <a data-link-type="dfn" href="#mixpresentationelementannotations" id="ref-for-mixpresentationelementannotations">MixPresentationElementAnnotations()</a> class, which provides informational metadata that the playback system MAY use to display information to the user. It is not used in the rendering or mixing process to generate the final output audio signal.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rendering_config">rendering_config</dfn> is an instance of the <a data-link-type="dfn" href="#renderingconfig" id="ref-for-renderingconfig">RenderingConfig()</a> class, which provides the metadata required for rendering the referenced <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤①">Audio Element</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="element_mix_config">element_mix_config</dfn> is an instance of the <a data-link-type="dfn" href="#elementmixconfig" id="ref-for-elementmixconfig">ElementMixConfig()</a> class, which provides the metadata required for applying any processing to the referenced and rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤②">Audio Element</a> before being summed with other processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤③">Audio Element</a>s.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_mix_config">output_mix_config</dfn> is an instance of the <a data-link-type="dfn" href="#outputmixconfig" id="ref-for-outputmixconfig">OutputMixConfig()</a> class, which  provides the metadata required for post-processing the mixed audio signal to generate the audio signal for playback.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_layouts">num_layouts</dfn> specifies the number of layouts for this sub-mix on which the <a data-link-type="dfn" href="#loudness" id="ref-for-loudness">loudness</a> information was measured.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudness_layout">loudness_layout</dfn> provides information about the <a href="#syntax-layout">layout</a> that was used to measure the <a data-link-type="dfn" href="#loudness" id="ref-for-loudness①">loudness</a> information provided in this sub-mix.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudness">loudness</dfn> provides the loudness information which was measured on <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout">loudness_layout</a> for the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation③">Rendered Mix Presentation</a> by this sub-mix.</p>
-   <p>The layout specified in <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①">loudness_layout</a> SHOULD NOT be higher than the highest layout among the layouts provided by the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤③">Audio Element</a>s. In other words, rendering from an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤④">Audio Element</a> with the highest layout to the <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②">loudness_layout</a> SHOULD NOT require an up-mix. The exception is when the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑤">Audio Element</a> is a zero-order Ambisonics or Mono channel; they MAY be rendered to Stereo. In this exception case, the <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout③">loudness_layout</a> for a zero-order Ambisonics or Mono channel <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑥">Audio Element</a> SHOULD NOT be higher than Stereo.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudness_layout">loudness_layout</dfn> is an instance of the <a data-link-type="dfn" href="#layout" id="ref-for-layout">Layout()</a> class, which provides information about the layout that was used to measure the <a data-link-type="dfn" href="#loudness" id="ref-for-loudness①">loudness</a> information provided in this sub-mix.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudness">loudness</dfn> is an instance of the <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo">LoudnessInfo()</a> class, which provides the loudness information for this sub-mix’s <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation③">Rendered Mix Presentation</a>, measured on the layout provided by <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout">loudness_layout</a>.</p>
+   <p>The layout specified in <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①">loudness_layout</a> SHOULD NOT be higher than the highest layout among the layouts provided by the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤④">Audio Element</a>s. In other words, rendering from an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑤">Audio Element</a> with the highest layout to the <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②">loudness_layout</a> SHOULD NOT require an up-mix. The exception is when the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑥">Audio Element</a> is a zero-order Ambisonics or Mono channel; they MAY be rendered to Stereo. In this exception case, the <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout③">loudness_layout</a> for a zero-order Ambisonics or Mono channel <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑦">Audio Element</a> SHOULD NOT be higher than Stereo.</p>
    <p>Each sub-mix SHALL include <a data-link-type="dfn" href="#loudness" id="ref-for-loudness②">loudness</a> for Stereo (i.e., a <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout④">loudness_layout</a> with the <a data-link-type="dfn" href="#sound_system" id="ref-for-sound_system">sound_system</a> field = <a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2051-3-202205-I!!PDF-E.pdf#" id="ref-for-something⑨">Loudspeaker configuration for Sound System A (0+2+0)</a>).</p>
    <ul>
     <li data-md>
@@ -3100,35 +3112,38 @@ <h3 class="heading settled" data-level="3.7" id="obu-mixpresentation"><span clas
 \[\text{L} = 0.707 \times \text{Mono}\]
 \[\text{R} = 0.707 \times \text{Mono}\]</p>
    </ul>
-   <p>If a sub-mix in a <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①">Mix Presentation OBU</a> includes only one single scalable channel audio, it SHALL comply with the following:</p>
+   <p>If a sub-mix in a <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu③">Mix Presentation OBU</a> includes only one single scalable channel audio, it SHALL comply with the following:</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#num_layouts" id="ref-for-num_layouts">num_layouts</a> SHALL be greater than or equal to the <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑤">num_layers</a> field specified in its <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config②">scalable_channel_layout_config</a>, except in the following cases:</p>
+     <p><a data-link-type="dfn" href="#num_layouts" id="ref-for-num_layouts">num_layouts</a> SHALL be greater than or equal to the <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑤">num_layers</a> field specified in its <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config">scalable_channel_layout_config</a>, except in the following cases:</p>
      <ul>
       <li data-md>
-       <p>The highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout⑤">loudness_layout</a> specified in one sub-mix is the layout that was used for authoring the sub-mix. The exception is when the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑦">Audio Element</a> is a zero-order Ambisonics or Mono channel.</p>
+       <p>The highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout⑤">loudness_layout</a> specified in one sub-mix is the layout that was used for authoring the sub-mix. The exception is when the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑧">Audio Element</a> is a zero-order Ambisonics or Mono channel.</p>
       <li data-md>
-       <p>The highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout⑥">loudness_layout</a> for a zero-order Ambisonics or Mono channel <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑧">Audio Element</a> is Stereo.</p>
+       <p>The highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout⑥">loudness_layout</a> for a zero-order Ambisonics or Mono channel <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑨">Audio Element</a> is Stereo.</p>
      </ul>
    </ul>
    <h4 class="heading settled" data-level="3.7.1" id="obu-mixpresentation-annotation"><span class="secno">3.7.1. </span><span class="content">Mix Presentation Annotations Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation-annotation"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mixpresentationannotations">MixPresentationAnnotations()</dfn> class provides informational metadata about a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⓪">Mix Presentation</a>. This section specifies the syntax structure of the <a data-link-type="dfn" href="#mixpresentationannotations" id="ref-for-mixpresentationannotations①">MixPresentationAnnotations()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class MixPresentationAnnotations() {
   string mix_presentation_friendly_label;
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_friendly_label">mix_presentation_friendly_label</dfn> specifies a human-friendly label to describe this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⓪">Mix Presentation</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_presentation_friendly_label">mix_presentation_friendly_label</dfn> specifies a human-friendly label to describe this <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②①">Mix Presentation</a>.</p>
    <h4 class="heading settled" data-level="3.7.2" id="obu-mixpresentation-elementannotation"><span class="secno">3.7.2. </span><span class="content">Mix Presentation Element Annotations Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation-elementannotation"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mixpresentationelementannotations">MixPresentationElementAnnotations()</dfn> class provides informational metadata about an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⓪">Audio Element</a> referred to a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②②">Mix Presentation</a>. This section specifies the syntax structure of the <a data-link-type="dfn" href="#mixpresentationelementannotations" id="ref-for-mixpresentationelementannotations①">MixPresentationElementAnnotations()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class MixPresentationElementAnnotations() {
   string audio_element_friendly_label;
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_element_friendly_label">audio_element_friendly_label</dfn> specifies a human-friendly label to describe the referenced <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤⑨">Audio Element</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_element_friendly_label">audio_element_friendly_label</dfn> specifies a human-friendly label to describe the referenced <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥①">Audio Element</a>.</p>
    <h4 class="heading settled" data-level="3.7.3" id="syntax-rendering-config"><span class="secno">3.7.3. </span><span class="content">Rendering Config Syntax and Semantics</span><a class="self-link" href="#syntax-rendering-config"></a></h4>
-   <p>During playback, an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⓪">Audio Element</a> SHOULD be rendered using a pre-defined renderer according to <a href="#processing-mixpresentation-rendering">§ 7.3.2 Rendering an Audio Element</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="renderingconfig">RenderingConfig()</dfn> class provides information on how to render the referenced <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥②">Audio Element</a>. This section specifies the syntax structure of the <a data-link-type="dfn" href="#renderingconfig" id="ref-for-renderingconfig①">RenderingConfig()</a> class.</p>
+   <p>During playback, an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥③">Audio Element</a> SHOULD be rendered using a pre-defined renderer according to <a href="#processing-mixpresentation-rendering">§ 7.3.2 Rendering an Audio Element</a>.</p>
    <p><b>Syntax</b></p>
 <pre>class RenderingConfig() {
   unsigned int (2) headphones_rendering_mode;
@@ -3138,21 +3153,23 @@ <h4 class="heading settled" data-level="3.7.3" id="syntax-rendering-config"><spa
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="headphones_rendering_mode">headphones_rendering_mode</dfn> indicates whether the input channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥①">Audio Element</a> is rendered to stereo loudspeakers or spatialized with a binaural renderer when played back on headphones. If the playback layout is a loudspeaker layout or the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥②">Audio Element</a> is not CHANNEL_BASED, the parsers SHALL ignore this field.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="headphones_rendering_mode">headphones_rendering_mode</dfn> indicates whether the input channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥④">Audio Element</a> is rendered to stereo loudspeakers or spatialized with a binaural renderer when played back on headphones. If the playback layout is a loudspeaker layout or the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑤">Audio Element</a> is not CHANNEL_BASED, the parsers SHALL ignore this field.</p>
    <ul>
     <li data-md>
-     <p>0: Indicates that the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥③">Audio Element</a> SHALL be rendered to <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⓪">loudspeaker_layout</a> = Stereo.</p>
+     <p>0: Indicates that the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑥">Audio Element</a> SHALL be rendered to <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⓪">loudspeaker_layout</a> = Stereo.</p>
     <li data-md>
-     <p>1: Indicates that the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥④">Audio Element</a> SHALL be rendered with a binaural renderer.</p>
+     <p>1: Indicates that the input <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑦">Audio Element</a> SHALL be rendered with a binaural renderer.</p>
     <li data-md>
      <p>2~3: Reserved.</p>
    </ul>
-   <p>Parsers encountering a reserved value of <a data-link-type="dfn" href="#headphones_rendering_mode" id="ref-for-headphones_rendering_mode">headphones_rendering_mode</a> SHALL ignore the Mix Presentation OBU that contains this <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config">rendering_config</a>.</p>
+   <p>Parsers encountering a reserved value of <a data-link-type="dfn" href="#headphones_rendering_mode" id="ref-for-headphones_rendering_mode">headphones_rendering_mode</a> SHALL ignore the <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu④">Mix Presentation OBU</a> that contains this <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config">rendering_config</a>.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="reserved">reserved<a class="self-link" href="#reserved"></a></dfn> SHALL be ignored by the parser.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="rendering_config_extension_size">rendering_config_extension_size<a class="self-link" href="#rendering_config_extension_size"></a></dfn> indicates the size in bytes of <a data-link-type="dfn" href="#rendering_config_extension_bytes" id="ref-for-rendering_config_extension_bytes">rendering_config_extension_bytes</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rendering_config_extension_bytes">rendering_config_extension_bytes</dfn> represents reserved bytes for future use. Parsers compliant with this version of the specification SHOULD ignore these bytes.</p>
    <h4 class="heading settled" data-level="3.7.4" id="syntax-element-mix-config"><span class="secno">3.7.4. </span><span class="content">Element Mix Config Syntax and Semantics</span><a class="self-link" href="#syntax-element-mix-config"></a></h4>
-   <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config">element_mix_config</a> provides metadata for any processing that needs to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑤">Audio Element</a> signal.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="elementmixconfig">ElementMixConfig()</dfn> class provides metadata for any processing that needs to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑧">Audio Element</a> signal.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mixgainparamdefinition">MixGainParamDefinition()</dfn> class provides the parameter definition for any mix gains that need to be applied to a signal.</p>
+   <p>This section specifies the syntax structures of the <a data-link-type="dfn" href="#elementmixconfig" id="ref-for-elementmixconfig①">ElementMixConfig()</a> and the <a data-link-type="dfn" href="#mixgainparamdefinition" id="ref-for-mixgainparamdefinition①">MixGainParamDefinition()</a> classes.</p>
    <p><b>Syntax</b></p>
 <pre>class ElementMixConfig() {
   MixGainParamDefinition mix_gain;
@@ -3163,19 +3180,19 @@ <h4 class="heading settled" data-level="3.7.4" id="syntax-element-mix-config"><s
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_gain">mix_gain</dfn> provides the parameter definition for the gain value that is applied to all channels of the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑥">Audio Element</a> signal. The parameter definition is provided by MixGainParamDefinition() and the corresponding parameter data to be provided in parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑤">parameter_id</a> is specified in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data">mix_gain_parameter_data</a>.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="default_mix_gain">default_mix_gain</dfn> specifies the default mix gain value to apply when there are no mix gain parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑥">parameter_id</a> provided. This value is expressed in dB and SHALL be applied to all channels in the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑦">Audio Element</a>. It is stored as a 16-bit, signed, two’s complement fixed-point value with 8 fractional bits (i.e., Q7.8)(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_gain">mix_gain</dfn> is an instance of the <a data-link-type="dfn" href="#mixgainparamdefinition" id="ref-for-mixgainparamdefinition②">MixGainParamDefinition()</a> class, which provides the parameter definition for the gain value that is applied to all channels of the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑨">Audio Element</a> signal. The corresponding parameter data to be provided in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑦">Parameter Block OBU</a>s with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑦">parameter_id</a> is specified in the <a data-link-type="dfn" href="#mixgainparamdefinition" id="ref-for-mixgainparamdefinition③">MixGainParamDefinition()</a> class.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="default_mix_gain">default_mix_gain</dfn> specifies the default mix gain value to apply when there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑧">Parameter Block OBU</a>s with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑧">parameter_id</a> provided. This value is expressed in dB and SHALL be applied to all channels in the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⓪">Audio Element</a>. It is stored as a 16-bit, signed, two’s complement fixed-point value with 8 fractional bits (i.e., Q7.8)(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
    <h4 class="heading settled" data-level="3.7.5" id="obu-mixpresentation-outputmix"><span class="secno">3.7.5. </span><span class="content">Output Mix Config Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation-outputmix"></a></h4>
-   <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config">output_mix_config</a> provides metadata for any processing that needs to be applied to the mixed audio signal.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="outputmixconfig">OutputMixConfig()</dfn> class provides metadata for any processing that needs to be applied to the mixed audio signal. This section specifies the syntax structure of the <a data-link-type="dfn" href="#outputmixconfig" id="ref-for-outputmixconfig①">OutputMixConfig()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class OutputMixConfig() {
   MixGainParamDefinition output_mix_gain;
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_mix_gain">output_mix_gain</dfn> provides the parameter definition for the gain value that is applied to all channels of the mixed audio signal. The parameter definition is provided by MixGainParamDefinition() and the corresponding parameter data to be provided in parameter blocks with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑦">parameter_id</a> is specified in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data①">mix_gain_parameter_data</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_mix_gain">output_mix_gain</dfn> is an instance of the <a data-link-type="dfn" href="#mixgainparamdefinition" id="ref-for-mixgainparamdefinition④">MixGainParamDefinition()</a> class, which provides the parameter definition for the gain value that is applied to all channels of the mixed audio signal. The corresponding parameter data to be provided in <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑨">Parameter Block OBU</a>s with the same <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑨">parameter_id</a> is specified in the <a data-link-type="dfn" href="#mixgainparameterdata" id="ref-for-mixgainparameterdata">MixGainParameterData()</a> class.</p>
    <h4 class="heading settled" data-level="3.7.6" id="syntax-layout"><span class="secno">3.7.6. </span><span class="content">Layout Syntax and Semantics</span><a class="self-link" href="#syntax-layout"></a></h4>
-   <p>The Layout() class specifies either a binaural system or a sound system with pre-defined physical loudspeaker positions according to <a data-link-type="biblio" href="#biblio-itu-2051-3" title="Advance sound system for programme production">[ITU-2051-3]</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="layout">Layout()</dfn> class specifies either a binaural system or a sound system with pre-defined physical loudspeaker positions according to <a data-link-type="biblio" href="#biblio-itu-2051-3" title="Advance sound system for programme production">[ITU-2051-3]</a>. This section specifies the syntax structure of the <a data-link-type="dfn" href="#layout" id="ref-for-layout①">Layout()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class Layout() {
   unsigned int (2) layout_type;
@@ -3235,9 +3252,9 @@ <h4 class="heading settled" data-level="3.7.6" id="syntax-layout"><span class="s
     <li data-md>
      <p>13 ~ 15: Reserved</p>
    </ul>
-   <p>When a value for <a data-link-type="dfn" href="#layout_type" id="ref-for-layout_type">layout_type</a> or <a data-link-type="dfn" href="#sound_system" id="ref-for-sound_system①">sound_system</a> is not supported, parsers compliant with this version of the specification SHOULD ignore this Layout() and any associated <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo">LoudnessInfo()</a>.</p>
+   <p>When a value for <a data-link-type="dfn" href="#layout_type" id="ref-for-layout_type">layout_type</a> or <a data-link-type="dfn" href="#sound_system" id="ref-for-sound_system①">sound_system</a> is not supported, parsers compliant with this version of the specification SHOULD ignore this <a data-link-type="dfn" href="#layout" id="ref-for-layout②">Layout()</a> and any associated <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①">LoudnessInfo()</a>.</p>
    <h4 class="heading settled" data-level="3.7.7" id="obu-mixpresentation-loudness"><span class="secno">3.7.7. </span><span class="content">Loudness Info Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation-loudness"></a></h4>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudnessinfo">LoudnessInfo()</dfn> provides loudness information for a given audio signal.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudnessinfo">LoudnessInfo()</dfn> class provides loudness information for a given audio signal. This section specifies the syntax structure of the <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo②">LoudnessInfo()</a> class.</p>
    <p>Each signed value is stored as Q7.8 fixed-point values(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
    <p><b>Syntax</b></p>
 <pre>class LoudnessInfo() {
@@ -3280,14 +3297,14 @@ <h4 class="heading settled" data-level="3.7.7" id="obu-mixpresentation-loudness"
   2   : Album
 3~255 : Reserved
 </pre>
-   <p>There SHALL be no duplicate values of <a data-link-type="dfn" href="#anchor_element" id="ref-for-anchor_element">anchor_element</a> within one LoudnessInfo(). When a reserved value of <a data-link-type="dfn" href="#anchor_element" id="ref-for-anchor_element①">anchor_element</a> is set, parsers compliant with this version of the specification MAY treat it as Unknown.</p>
+   <p>There SHALL be no duplicate values of <a data-link-type="dfn" href="#anchor_element" id="ref-for-anchor_element">anchor_element</a> within one <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo③">LoudnessInfo()</a>. When a reserved value of <a data-link-type="dfn" href="#anchor_element" id="ref-for-anchor_element①">anchor_element</a> is set, parsers compliant with this version of the specification MAY treat it as Unknown.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="anchored_loudness">anchored_loudness<a class="self-link" href="#anchored_loudness"></a></dfn> specifies the loudness information according to the anchor element, specified in <a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-4-201510-I!!PDF-E.pdf#" id="ref-for-something②①">LKFS</a> as defined in <a data-link-type="biblio" href="#biblio-itu-1770-4" title="Algorithms to measure audio programme loudness and true-peak audio level">[ITU-1770-4]</a>.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="biblio" href="#biblio-itu-1770-4" title="Algorithms to measure audio programme loudness and true-peak audio level">[ITU-1770-4]</a> adopts the convention of using the dBov unit for dBFS, where the RMS value of a full-scale square wave is 0 dBov. The same convention is adopted here.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="info_type_size">info_type_size<a class="self-link" href="#info_type_size"></a></dfn> indicates the size in bytes of <a data-link-type="dfn" href="#info_type_bytes" id="ref-for-info_type_bytes">info_type_bytes</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="info_type_bytes">info_type_bytes</dfn> represents reserved bytes for future use when new marks of <a data-link-type="dfn" href="#info_type" id="ref-for-info_type①">info_type</a> are defined. Parsers compliant with this version of the specification SHOULD ignore these bytes.</p>
    <h3 class="heading settled" data-level="3.8" id="obu-parameterblock"><span class="secno">3.8. </span><span class="content">Parameter Block OBU Syntax and Semantics</span><a class="self-link" href="#obu-parameterblock"></a></h3>
-   <p>This section specifies the OBU payload of the Parameter Block OBU.</p>
-   <p>The metadata specified in this OBU defines the parameter values for an algorithm for an indicated duration, including any animation of the parameter values over this duration. The metadata is used in conjunction with a corresponding parameter definition and parameter data specification. The parameter definition is specified based on <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition">ParamDefinition()</a>. The parameter data provides the values to apply in each parameter block. These are specified using the AnimatedParameterData() function template if parameter animation is supported.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="parameter-block-obu">Parameter Block OBU</dfn> provides the parameter values in <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑦">Parameter Substream</a>s and information on how they are animated over the indicated duration. This section specifies the payload format of the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⓪">Parameter Block OBU</a>.</p>
+   <p>The metadata specified in this OBU is used in conjunction with a corresponding parameter definition and parameter data specification. The parameter definition is specified based on <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition">ParamDefinition()</a>. The parameter data provides the values to apply in each parameter block. These are specified using the <a data-link-type="dfn" href="#animatedparameterdata" id="ref-for-animatedparameterdata">AnimatedParameterData()</a> function template if parameter animation is supported.</p>
    <p><b>Syntax</b></p>
 <pre>class ParameterBlockOBU() {
   leb128() parameter_id;
@@ -3329,10 +3346,10 @@ <h3 class="heading settled" data-level="3.8" id="obu-parameterblock"><span class
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-parameter_id">parameter_id</dfn> indicates the identifier for a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑦">Parameter Substream</a> which this <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①③">Parameter Block OBU</a> refers to.  If no <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑥">Audio Element OBU</a>s or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②">Mix Presentation OBU</a>s refer to this <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑧">parameter_id</a>, parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①④">Parameter Block OBU</a>s with this identifier.</p>
-   <p><dfn data-dfn-type="dfn" data-noexport id="get_param_definition">get_param_definition()<a class="self-link" href="#get_param_definition"></a></dfn> is a run-time function to get the <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type③">param_definition_type</a> and <a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode②">param_definition_mode</a> from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑦">Audio Element OBU</a> or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu③">Mix Presentation OBU</a> that references this <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id⑨">parameter_id</a>.</p>
-   <p>If <a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode③">param_definition_mode</a> = 0, this function additionally gets the following fields from the same <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑧">Audio Element OBU</a> or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu④">Mix Presentation OBU</a>: <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑨">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks⑥">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑨">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration⑤">subblock_duration</a>.</p>
-   <p>When it gets an unknown <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type④">param_definition_type</a>, parsers compliant with this version of the specification SHOULD ignore the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑤">Parameter Block OBU</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-parameter_id">parameter_id</dfn> indicates the identifier for a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑧">Parameter Substream</a> which this <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②①">Parameter Block OBU</a> refers to.  If no <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑨">Audio Element OBU</a>s or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑤">Mix Presentation OBU</a>s refer to this <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⓪">parameter_id</a>, parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②②">Parameter Block OBU</a>s with this identifier.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="get_param_definition">get_param_definition()<a class="self-link" href="#get_param_definition"></a></dfn> is a run-time function to get the <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type③">param_definition_type</a> and <a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode②">param_definition_mode</a> from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⓪">Audio Element OBU</a> or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑥">Mix Presentation OBU</a> that references this <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①①">parameter_id</a>.</p>
+   <p>If <a data-link-type="dfn" href="#param_definition_mode" id="ref-for-param_definition_mode③">param_definition_mode</a> = 0, this function additionally gets the following fields from the same <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①①">Audio Element OBU</a> or <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑦">Mix Presentation OBU</a>: <a data-link-type="dfn" href="#paramdefinition-duration" id="ref-for-paramdefinition-duration⑨">duration</a>, <a data-link-type="dfn" href="#paramdefinition-num_subblocks" id="ref-for-paramdefinition-num_subblocks⑥">num_subblocks</a>, <a data-link-type="dfn" href="#paramdefinition-constant_subblock_duration" id="ref-for-paramdefinition-constant_subblock_duration⑨">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#paramdefinition-subblock_duration" id="ref-for-paramdefinition-subblock_duration⑤">subblock_duration</a>.</p>
+   <p>When it gets an unknown <a data-link-type="dfn" href="#param_definition_type" id="ref-for-param_definition_type④">param_definition_type</a>, parsers compliant with this version of the specification SHOULD ignore the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②③">Parameter Block OBU</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-duration">duration</dfn> specifies the duration for which this parameter block is valid and applicable. It SHALL NOT be set to 0.</p>
    <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-constant_subblock_duration">constant_subblock_duration</dfn> specifies the duration of each subblock, in the case where all subblocks except the last subblock have equal durations. If all subblocks except the last subblock do not have equal durations, the value of <a data-link-type="dfn" href="#parameter_block_obu-constant_subblock_duration" id="ref-for-parameter_block_obu-constant_subblock_duration">constant_subblock_duration</a> SHALL be set to 0.</p>
    <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-num_subblocks">num_subblocks</dfn> specifies the number of different sets of parameter values specified in this parameter block, where each set describes a different subblock of the timeline, contiguously. When <a data-link-type="dfn" href="#parameter_block_obu-constant_subblock_duration" id="ref-for-parameter_block_obu-constant_subblock_duration①">constant_subblock_duration</a> not equal to 0, <a data-link-type="dfn" href="#parameter_block_obu-num_subblocks" id="ref-for-parameter_block_obu-num_subblocks">num_subblocks</a> is implicitly calculated as</p>
@@ -3341,10 +3358,13 @@ <h3 class="heading settled" data-level="3.8" id="obu-parameterblock"><span class
 \]</p>
    <p><dfn class="dfn-paneled" data-dfn-for="parameter_block_obu" data-dfn-type="dfn" data-noexport id="parameter_block_obu-subblock_duration">subblock_duration</dfn> specifies the duration for the given subblock. It SHALL NOT be set to 0.</p>
    <p>The values of <a data-link-type="dfn" href="#parameter_block_obu-duration" id="ref-for-parameter_block_obu-duration">duration</a>, <a data-link-type="dfn" href="#parameter_block_obu-constant_subblock_duration" id="ref-for-parameter_block_obu-constant_subblock_duration②">constant_subblock_duration</a>, and <a data-link-type="dfn" href="#parameter_block_obu-subblock_duration" id="ref-for-parameter_block_obu-subblock_duration">subblock_duration</a> SHALL be expressed as the number of ticks at the <a data-link-type="dfn" href="#parameter_rate" id="ref-for-parameter_rate③">parameter_rate</a> specified in the corresponding parameter definition.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_gain_parameter_data">mix_gain_parameter_data</dfn> is an instance of the <a data-link-type="dfn" href="#mixgainparameterdata" id="ref-for-mixgainparameterdata①">MixGainParameterData()</a> class, which provides the parameter values to apply in this parameter block.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixing_info_parameter_data">demixing_info_parameter_data</dfn> is an instance of the <a data-link-type="dfn" href="#demixinginfoparameterdata" id="ref-for-demixinginfoparameterdata①">DemixingInfoParameterData()</a> class, which provides the parameter values to apply in this parameter block.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_info_parameter_data">recon_gain_info_parameter_data</dfn> is an instance of the <a data-link-type="dfn" href="#recongaininfoparameterdata" id="ref-for-recongaininfoparameterdata①">ReconGainInfoParameterData()</a> class, which provides the parameter values to apply in this parameter block.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="parameter_data_size">parameter_data_size<a class="self-link" href="#parameter_data_size"></a></dfn> indicates the size in bytes of <a data-link-type="dfn" href="#parameter_data_bytes" id="ref-for-parameter_data_bytes">parameter_data_bytes</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="parameter_data_bytes">parameter_data_bytes</dfn> represents reserved bytes for future use when new syntaxes are defined. Parsers compliant with this version of the specification SHOULD ignore these bytes.</p>
    <h4 class="heading settled" data-level="3.8.1" id="syntax-mix-gain-param"><span class="secno">3.8.1. </span><span class="content">Mix Gain Parameter Data Syntax and Semantics</span><a class="self-link" href="#syntax-mix-gain-param"></a></h4>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix_gain_parameter_data">mix_gain_parameter_data</dfn> specifies a gain parameter data to be used when mixing <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑧">Audio Element</a>s.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mixgainparameterdata">MixGainParameterData()</dfn> class provides the gain parameter data to be used when mixing <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦①">Audio Element</a>s. This section specifies the syntax structure of the <a data-link-type="dfn" href="#mixgainparameterdata" id="ref-for-mixgainparameterdata②">MixGainParameterData()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class MixGainParameterData() {
   leb128() animation_type;
@@ -3352,13 +3372,14 @@ <h4 class="heading settled" data-level="3.8.1" id="syntax-mix-gain-param"><span
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="animation_type">animation_type</dfn> specifies the type of animation applied to the parameter values. When an unknown value of <a data-link-type="dfn" href="#animation_type" id="ref-for-animation_type">animation_type</a> is used, parsers compliant with this version of the specification SHOULD ignore the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑥">Parameter Block OBU</a> that contains this <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data②">mix_gain_parameter_data</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="animation_type">animation_type</dfn> specifies the type of animation applied to the parameter values. When an unknown value of <a data-link-type="dfn" href="#animation_type" id="ref-for-animation_type">animation_type</a> is used, parsers compliant with this version of the specification SHOULD ignore the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②④">Parameter Block OBU</a> that contains this <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data">mix_gain_parameter_data</a>.</p>
 <pre class="def">animation_type : Animation Type
        0       : STEP
        1       : LINEAR
        2       : BEZIER
 </pre>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_data">param_data</dfn> uses the AnimatedParameterData function template. Each of the values defined within this instance (<a data-link-type="dfn" href="#start_point_value" id="ref-for-start_point_value">start_point_value</a>, <a data-link-type="dfn" href="#end_point_value" id="ref-for-end_point_value">end_point_value</a>, and <a data-link-type="dfn" href="#control_point_value" id="ref-for-control_point_value">control_point_value</a>) is expressed in dB. The values SHALL be applied to all channels in the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥⑨">Audio Element</a> and SHALL be applied as described in <a href="#processing-animated-params">§ 7.4 Animated Parameters</a>. They are stored as 16-bit, signed, two’s complement fixed-point values with 8 fractional bits (i.e., Q7.8)(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="param_data">param_data</dfn> uses the <a data-link-type="dfn" href="#animatedparameterdata" id="ref-for-animatedparameterdata①">AnimatedParameterData()</a> function template. Each of the values defined within this instance (<a data-link-type="dfn" href="#start_point_value" id="ref-for-start_point_value">start_point_value</a>, <a data-link-type="dfn" href="#end_point_value" id="ref-for-end_point_value">end_point_value</a>, and <a data-link-type="dfn" href="#control_point_value" id="ref-for-control_point_value">control_point_value</a>) is expressed in dB. The values SHALL be applied to all channels in the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦②">Audio Element</a> and SHALL be applied as described in <a href="#processing-animated-params">§ 7.4 Animated Parameters</a>. They are stored as 16-bit, signed, two’s complement fixed-point values with 8 fractional bits (i.e., Q7.8)(<a data-link-type="biblio" href="#biblio-q-format" title="Q (number format)">[Q-Format]</a>).</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="animatedparameterdata">AnimatedParameterData()</dfn> function template provides information which is required for animating a set of parameter values. The syntax structure of the <a data-link-type="dfn" href="#animatedparameterdata" id="ref-for-animatedparameterdata②">AnimatedParameterData()</a> function template is specified below.</p>
 <pre>template &lt;class T>
 class AnimatedParameterData(animation_type) {
   if (animation_type == STEP) {
@@ -3382,7 +3403,7 @@ <h4 class="heading settled" data-level="3.8.1" id="syntax-mix-gain-param"><span
    <p><dfn data-dfn-type="dfn" data-noexport id="control_point_relative_time">control_point_relative_time<a class="self-link" href="#control_point_relative_time"></a></dfn> specifies the time of the middle control point of a quadratic Bezier curve, i.e., its x-axis value. This value is expressed as a fraction of the parameter subblock duration with valid values in the range of 0 and 1, inclusively. A value equal to 0 indicates that this animation implements a linear Bezier curve, in which case <a data-link-type="dfn" href="#control_point_value" id="ref-for-control_point_value①">control_point_value</a> SHALL be ignored by the IA parser. It is stored as an 8-bit, unsigned, fixed-point value with 8 fractional bits. That is, a 8-bit unsigned integer, that is implicitly multiplied by the scaling factor 2^(−8).</p>
    <p>The method of applying the animation is described in <a href="#processing-animated-params">§ 7.4 Animated Parameters</a>.</p>
    <h4 class="heading settled" data-level="3.8.2" id="syntax-demixing-info"><span class="secno">3.8.2. </span><span class="content">Demixing Info Parameter Data Syntax and Semantics</span><a class="self-link" href="#syntax-demixing-info"></a></h4>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixing_info_parameter_data">demixing_info_parameter_data</dfn> specifies the demixing parameter mode to be used to reconstruct the output channel audio according to its <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①③">loudspeaker_layout</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixinginfoparameterdata">DemixingInfoParameterData()</dfn> class provides the demixing parameter mode to be used to reconstruct the output channel audio according to its <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①③">loudspeaker_layout</a>. This section specifies the syntax structure of the <a data-link-type="dfn" href="#demixinginfoparameterdata" id="ref-for-demixinginfoparameterdata②">DemixingInfoParameterData()</a> class.</p>
    <p><b>Syntax</b></p>
 <pre>class DemixingInfoParameterData() {
   unsigned int (3) dmixp_mode;
@@ -3415,8 +3436,8 @@ <h4 class="heading settled" data-level="3.8.2" id="syntax-demixing-info"><span c
     <figcaption>IA Down-mix Mechanism</figcaption>
    </center>
    <h4 class="heading settled" data-level="3.8.3" id="syntax-recon-gain-info"><span class="secno">3.8.3. </span><span class="content">Recon Gain Info Parameter Data Syntax and Semantics</span><a class="self-link" href="#syntax-recon-gain-info"></a></h4>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_info_parameter_data">recon_gain_info_parameter_data</dfn> contains recon gain values for demixed channels.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data④">recon_gain_info_parameter_data</a> is required to compensate for the errors propagated by the De-mixer and Gain modules specified in <a href="#processing-scalablechannelaudio-demixer">§ 7.2.2 De-mixer</a> and <a href="#processing-scalablechannelaudio-gain">§ 7.2.1 Gain</a>, due to the errors caused by lossy codecs such as OPUS and AAC-LC. However, it is not required for lossless codecs such as FLAC and LPCM because the propagated errors are negligible.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recongaininfoparameterdata">ReconGainInfoParameterData()</dfn> class contains recon gain values for demixed channels. This section specifies the syntax structure of the <a data-link-type="dfn" href="#recongaininfoparameterdata" id="ref-for-recongaininfoparameterdata②">ReconGainInfoParameterData()</a> class.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data③">recon_gain_info_parameter_data</a> is required to compensate for the errors propagated by the De-mixer and Gain modules specified in <a href="#processing-scalablechannelaudio-demixer">§ 7.2.2 De-mixer</a> and <a href="#processing-scalablechannelaudio-gain">§ 7.2.1 Gain</a>, due to the errors caused by lossy codecs such as OPUS and AAC-LC. However, it is not required for lossless codecs such as FLAC and LPCM because the propagated errors are negligible.</p>
    <p><b>Syntax</b></p>
 <pre>class ReconGainInfoParameterData() {
   for (i=0; i&lt; num_layers; i++) {
@@ -3456,14 +3477,14 @@ <h4 class="heading settled" data-level="3.8.3" id="syntax-recon-gain-info"><span
    <p><dfn data-dfn-type="dfn" data-noexport id="n-i">n(i)<a class="self-link" href="#n-i"></a></dfn> indicates the number of bits for <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags①">recon_gain_flags</a>(i), where i = 0, 1, ..., <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑥">num_layers</a> - 1. It SHALL be 7 or 12 as shown in the table above.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain">recon_gain</dfn> indicates the gain value to be applied to the channels identified by <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags②">recon_gain_flags</a>, after decoding the associated audio frames and carrying out the demixing operation. Details on how this value is used are specified in <a href="#processing-scalablechannelaudio-recongain">§ 7.2.3 Recon Gain</a>.</p>
    <h3 class="heading settled" data-level="3.9" id="obu-audioframe"><span class="secno">3.9. </span><span class="content">Audio Frame OBU Syntax and Semantics</span><a class="self-link" href="#obu-audioframe"></a></h3>
-   <p>This section specifies the OBU payload of the Audio Frame OBU.</p>
-   <p><dfn class="dfn-paneled" data-dfn-for="audio_substream" data-dfn-type="dfn" data-noexport id="audio_substream-audio_substream_id">audio_substream_id</dfn> defines an identifier for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑥">Audio Substream</a> associated with this audio frame. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑤">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id③">audio_substream_id</a> per <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑦">Audio Substream</a>. There SHALL be exactly one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu⑨">Audio Element OBU</a> with a given <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id①">audio_substream_id</a> in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①②">Descriptors</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-frame-obu">Audio Frame OBU</dfn> provides the coded audio frame for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑧">Audio Substream</a>. This section specifies the payload format of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑥">Audio Frame OBU</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-for="audio_substream" data-dfn-type="dfn" data-noexport id="audio_substream-audio_substream_id">audio_substream_id</dfn> defines an identifier for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑨">Audio Substream</a> associated with this audio frame. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑤">IA Sequence</a>, there SHALL be one unique <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id③">audio_substream_id</a> per <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⓪">Audio Substream</a>. There SHALL be exactly one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①②">Audio Element OBU</a> with a given <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id①">audio_substream_id</a> in a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①②">Descriptors</a>.</p>
    <p><b>Syntax</b></p>
 <pre>class AudioFrameOBU(audio_substream_id_in_bitstream) {
   if (audio_substream_id_in_bitstream) {
      leb128() explicit_audio_substream_id;
   }
-  unsigned int (8 x coded_frame_size) audio_frame();
+  unsigned int (8 x coded_frame_size) audio_frame;
 }
 </pre>
    <p><b>Semantics</b></p>
@@ -3475,41 +3496,41 @@ <h3 class="heading settled" data-level="3.9" id="obu-audioframe"><span class="se
      <p><code>false</code> for <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑦">obu_type</a> = OBU_IA_Audio_Frame_ID0, OBU_IA_Audio_Frame_ID1, ..., or OBU_IA_Audio_Frame_ID17.</p>
    </ul>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="explicit_audio_substream_id">explicit_audio_substream_id</dfn> indicates the <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑤">audio_substream_id</a> of this frame. The value SHALL be greater than 17. When this field is not present, <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑥">audio_substream_id</a> is implicit and is defined as a value from 0 to 17 for OBU_IA_Audio_Frame_ID0 to OBU_IA_Audio_Frame_ID17, respectively.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The first 18 <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑧">Audio Substream</a>s in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑦">IA Sequence</a> MAY use the OBU types OBU_IA_Audio_Frame_ID0 to OBU_IA_Audio_Frame_ID17, which have predefined <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑦">audio_substream_id</a>s associated with them. This reduces bitrate by avoiding the extra <a data-link-type="dfn" href="#explicit_audio_substream_id" id="ref-for-explicit_audio_substream_id">explicit_audio_substream_id</a> field in the bitstream.</p>
-   <p><dfn data-dfn-type="dfn" data-noexport id="coded_frame_size">coded_frame_size<a class="self-link" href="#coded_frame_size"></a></dfn> is the size of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame①">audio_frame()</a> in bytes.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_frame">audio_frame()</dfn> is the coded audio data for the frame. It is codec specific and its format is defined in <a href="#codec-specific">§ 3.11 Codec Specific</a>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The first 18 <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦①">Audio Substream</a>s in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑦">IA Sequence</a> MAY use the OBU types OBU_IA_Audio_Frame_ID0 to OBU_IA_Audio_Frame_ID17, which have predefined <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑦">audio_substream_id</a>s associated with them. This reduces bitrate by avoiding the extra <a data-link-type="dfn" href="#explicit_audio_substream_id" id="ref-for-explicit_audio_substream_id">explicit_audio_substream_id</a> field in the bitstream.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="coded_frame_size">coded_frame_size<a class="self-link" href="#coded_frame_size"></a></dfn> is the size of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame①">audio_frame</a> in bytes.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_frame">audio_frame</dfn> is the coded audio data for the frame. It is codec specific and its format is defined in <a href="#codec-specific">§ 3.11 Codec Specific</a>.</p>
    <h3 class="heading settled" data-level="3.10" id="obu-temporaldelimiter"><span class="secno">3.10. </span><span class="content">Temporal Delimiter OBU Syntax and Semantics</span><a class="self-link" href="#obu-temporaldelimiter"></a></h3>
-   <p>This section specifies the OBU payload of the Temporal Delimiter OBU.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="temporal-delimiter-obu">Temporal Delimiter OBU</dfn> identifies the <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit③">Temporal Units</a>. This section specifies the payload format of the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu②">Temporal Delimiter OBU</a>.</p>
    <p><b>Syntax</b></p>
 <pre>class TemporalDelimiterOBU() {
 }
 </pre>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①">Temporal Delimiter OBU</a> has an empty payload.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu③">Temporal Delimiter OBU</a> has an empty payload.</p>
    <h3 class="heading settled" data-level="3.11" id="codec-specific"><span class="secno">3.11. </span><span class="content">Codec Specific</span><a class="self-link" href="#codec-specific"></a></h3>
-   <p>This section defines codec-specific information for <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑦">codec_id</a>, <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑤">decoder_config</a> and the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑨">Audio Substream</a>.</p>
-   <p>To generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⓪">Audio Substream</a>, only mono or stereo coding SHALL be allowed for this version of the specification.</p>
-   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame②">audio_frame()</a> is exactly the same as the sample format (before packing OBU) for the audio file which consists of only one single coded stream by the <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑧">codec_id</a>.</p>
-   <p>For legacy codecs, <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑥">decoder_config</a> SHALL have exactly the same information as the output of a conventional file parser, which is fed to the codec’s decoders for decoding the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦①">Audio Substream</a>. For future codecs, <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑦">decoder_config</a> SHALL include all decoding parameters which are required to decode the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦②">Audio Substream</a>.</p>
+   <p>This section defines codec-specific information for <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑦">codec_id</a>, the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="decoderconfig">DecoderConfig()</dfn> class, and the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦②">Audio Substream</a>.</p>
+   <p>To generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦③">Audio Substream</a>, only mono or stereo coding SHALL be allowed for this version of the specification.</p>
+   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame②">audio_frame</a> is exactly the same as the sample format (before packing OBU) for the audio file which consists of only one single coded stream by the <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑧">codec_id</a>.</p>
+   <p>For legacy codecs, the <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig①">DecoderConfig()</a> class SHALL have exactly the same information as the output of a conventional file parser, which is fed to the codec’s decoders for decoding the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦④">Audio Substream</a>. For future codecs, the <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig②">DecoderConfig()</a> class SHALL include all decoding parameters which are required to decode the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑤">Audio Substream</a>.</p>
    <h4 class="heading settled" data-level="3.11.1" id="opus-specific"><span class="secno">3.11.1. </span><span class="content">OPUS Specific</span><a class="self-link" href="#opus-specific"></a></h4>
    <p><a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑨">codec_id</a> SHALL be <code>Opus</code>.</p>
-   <p><a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑧">decoder_config</a> for OPUS conforms to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②②">ID Header</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something②③">ChannelMappingFamily</a> = 0 in <a data-link-type="biblio" href="#biblio-rfc-7845" title="Ogg Encapsulation for the Opus Audio Codec">[RFC-7845]</a> with the following constraints:</p>
+   <p>The <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig③">DecoderConfig()</a> class for OPUS conforms to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②②">ID Header</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something②③">ChannelMappingFamily</a> = 0 in <a data-link-type="biblio" href="#biblio-rfc-7845" title="Ogg Encapsulation for the Opus Audio Codec">[RFC-7845]</a> with the following constraints:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②④">Magic Signature</a> SHALL NOT be present.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑤">Output Channel Count</a> SHALL be set to 2. <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑥">Output Channel Count</a> can be ignored because the real value can be determined from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⓪">Audio Element OBU</a> and from the <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc6716#" id="ref-for-something②⑦">Opus packet</a> header.</p>
+     <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑤">Output Channel Count</a> SHALL be set to 2. <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑥">Output Channel Count</a> can be ignored because the real value can be determined from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①③">Audio Element OBU</a> and from the <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc6716#" id="ref-for-something②⑦">Opus packet</a> header.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑧">Pre-skip</a> SHALL be the same as the number of audio samples to be trimmed at the start of coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦③">Audio Substream</a>s.</p>
+     <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑧">Pre-skip</a> SHALL be the same as the number of audio samples to be trimmed at the start of coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑥">Audio Substream</a>s.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something②⑨">Output Gain</a> SHALL NOT be used. In other words, it SHALL be set to 0 dB.</p>
     <li data-md>
      <p>The byte order of each field in <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc7845#" id="ref-for-something③⓪">ID Header</a> is converted to big-endian.</p>
    </ul>
-   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame③">audio_frame()</a> is an <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc6716#" id="ref-for-something③①">Opus packet</a> as specified in <a data-link-type="biblio" href="#biblio-rfc-6716" title="Definition of the Opus Audio Codec">[RFC-6716]</a>, which contains only one single frame of mono or stereo channels and which has a non-delimiting frame structure.</p>
+   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame③">audio_frame</a> is an <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc6716#" id="ref-for-something③①">Opus packet</a> as specified in <a data-link-type="biblio" href="#biblio-rfc-6716" title="Definition of the Opus Audio Codec">[RFC-6716]</a>, which contains only one single frame of mono or stereo channels and which has a non-delimiting frame structure.</p>
    <p>The sample rate used for computing offsets SHALL be 48 kHz.</p>
    <h4 class="heading settled" data-level="3.11.2" id="aac-lc-specific"><span class="secno">3.11.2. </span><span class="content">AAC-LC Specific</span><a class="self-link" href="#aac-lc-specific"></a></h4>
    <p><a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①⓪">codec_id</a> SHALL be <code>mp4a</code>.</p>
-   <p><a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑨">decoder_config</a> for AAC-LC is the <a data-link-type="dfn" href="https://www.iso.org/standard/55688.html#" id="ref-for-something③②">DecoderConfigDescriptor()</a> from <a data-link-type="biblio" href="#biblio-mp4-systems" title="Information technology — Coding of audio-visual objects — Part 1: Systems">[MP4-Systems]</a>, which is a subset of <a data-link-type="dfn" href="https://www.iso.org/standard/79110.html#" id="ref-for-something③③">ESDBox</a> for <a data-link-type="biblio" href="#biblio-mp4-audio" title="Information technology — Coding of audio-visual objects — Part 3: Audio">[MP4-Audio]</a>, with the following constraints:</p>
+   <p>The <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig④">DecoderConfig()</a> class for AAC-LC is the <a data-link-type="dfn" href="https://www.iso.org/standard/55688.html#" id="ref-for-something③②">DecoderConfigDescriptor()</a> from <a data-link-type="biblio" href="#biblio-mp4-systems" title="Information technology — Coding of audio-visual objects — Part 1: Systems">[MP4-Systems]</a>, which is a subset of <a data-link-type="dfn" href="https://www.iso.org/standard/79110.html#" id="ref-for-something③③">ESDBox</a> for <a data-link-type="biblio" href="#biblio-mp4-audio" title="Information technology — Coding of audio-visual objects — Part 3: Audio">[MP4-Audio]</a>, with the following constraints:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="https://www.iso.org/standard/55688.html#" id="ref-for-something③④">objectTypeIndication</a> = 0x40</p>
@@ -3523,7 +3544,7 @@ <h4 class="heading settled" data-level="3.11.2" id="aac-lc-specific"><span class
       <li data-md>
        <p><a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something③⑨">audioObjectType</a> = 2</p>
       <li data-md>
-       <p><a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④⓪">channelConfiguration</a> SHALL be set to 2. The real value can be implied from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①①">Audio Element OBU</a>.</p>
+       <p><a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④⓪">channelConfiguration</a> SHALL be set to 2. The real value can be implied from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①④">Audio Element OBU</a>.</p>
       <li data-md>
        <p><a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④①">GASpecificConfig()</a>: The syntax and values conform to <a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④②">GASpecificConfig()</a> from <a data-link-type="biblio" href="#biblio-mp4-audio" title="Information technology — Coding of audio-visual objects — Part 3: Audio">[MP4-Audio]</a> with the following constraints:</p>
        <ul>
@@ -3536,11 +3557,11 @@ <h4 class="heading settled" data-level="3.11.2" id="aac-lc-specific"><span class
        </ul>
      </ul>
    </ul>
-   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame④">audio_frame()</a> is one single <a data-link-type="dfn" href="https://www.iso.org/standard/43345.html#" id="ref-for-something④⑥">raw_data_block()</a> as specified in <a data-link-type="biblio" href="#biblio-aac" title="Information technology — Generic coding of moving pictures and associated audio information — Part 7: Advanced Audio Coding (AAC)">[AAC]</a>, which contains only one single frame of mono or stereo channels.</p>
+   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame④">audio_frame</a> is one single <a data-link-type="dfn" href="https://www.iso.org/standard/43345.html#" id="ref-for-something④⑥">raw_data_block()</a> as specified in <a data-link-type="biblio" href="#biblio-aac" title="Information technology — Generic coding of moving pictures and associated audio information — Part 7: Advanced Audio Coding (AAC)">[AAC]</a>, which contains only one single frame of mono or stereo channels.</p>
    <p>The sample rate used for computing offsets SHALL be the rate indicated by the <a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④⑦">samplingFrequencyIndex</a> in <a data-link-type="dfn" href="https://www.iso.org/standard/76383.html#" id="ref-for-something④⑧">GASpecificConfig()</a>.</p>
    <h4 class="heading settled" data-level="3.11.3" id="flac-specific"><span class="secno">3.11.3. </span><span class="content">FLAC Specific</span><a class="self-link" href="#flac-specific"></a></h4>
    <p><a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①①">codec_id</a> SHALL be <code>fLaC</code>, the FLAC stream marker in ASCII, meaning byte 0 of the stream is 0x66, followed by 0x4C 0x61 0x43.</p>
-   <p><a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①⓪">decoder_config</a> for FLAC is the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something④⑨">METADATA_BLOCK</a>s of <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> for mono or stereo channels. The <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⓪">METADATA_BLOCK_STREAMINFO</a> has the following constraints:</p>
+   <p>The <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig⑤">DecoderConfig()</a> class for FLAC is the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something④⑨">METADATA_BLOCK</a>s of <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> for mono or stereo channels. The <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⓪">METADATA_BLOCK_STREAMINFO</a> has the following constraints:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤①">minimum block size</a> SHALL be set to <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame⑤">num_samples_per_frame</a>.</p>
@@ -3551,11 +3572,11 @@ <h4 class="heading settled" data-level="3.11.3" id="flac-specific"><span class="
     <li data-md>
      <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤④">maximum frame size</a> SHOULD be set to 0.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑤">number of channels</a> SHALL be set to 1. <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑥">number of channels</a> can be ignored because the real value can be determined from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①②">Audio Element OBU</a> and from the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑦">Frame_Header</a>.</p>
+     <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑤">number of channels</a> SHALL be set to 1. <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑥">number of channels</a> can be ignored because the real value can be determined from the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑤">Audio Element OBU</a> and from the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑦">Frame_Header</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑧">MD5 signature</a> SHOULD be set to 0.</p>
    </ul>
-   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑤">audio_frame()</a> is <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑨">FRAME</a> of <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> which contains only one single frame of mono or stereo channels with the following constraints.</p>
+   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑤">audio_frame</a> is <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑤⑨">FRAME</a> of <a data-link-type="biblio" href="#biblio-flac" title="Free Lossless Audio Codec">[FLAC]</a> which contains only one single frame of mono or stereo channels with the following constraints.</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑥⓪">Block size in inter-channel samples</a> in the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑥①">FRAME_HEADER</a> SHALL be set to <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame⑦">num_samples_per_frame</a>.</p>
@@ -3569,7 +3590,7 @@ <h4 class="heading settled" data-level="3.11.3" id="flac-specific"><span class="
    <p>The sample rate used for computing offsets SHALL be the sampling rate indicated in the <a data-link-type="dfn" href="https://xiph.org/flac/format.html" id="ref-for-something⑦①">METADATA_BLOCK</a>.</p>
    <h4 class="heading settled" data-level="3.11.4" id="lpcm-specific"><span class="secno">3.11.4. </span><span class="content">LPCM Specific</span><a class="self-link" href="#lpcm-specific"></a></h4>
    <p><a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①②">codec_id</a> SHALL be <code>ipcm</code>.</p>
-   <p><a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①①">decoder_config</a> for LPCM is as follows:</p>
+   <p>The <a data-link-type="dfn" href="#decoderconfig" id="ref-for-decoderconfig⑥">DecoderConfig()</a> class for LPCM is as follows:</p>
 <pre>class DecoderConfig(ipcm) {
   unsigned int (8) sample_format_flags;
   unsigned int (8) sample_size;
@@ -3579,68 +3600,68 @@ <h4 class="heading settled" data-level="3.11.4" id="lpcm-specific"><span class="
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="sample_format_flags">sample_format_flags</dfn> complies with <a data-link-type="dfn" href="https://www.iso.org/standard/77752.html#" id="ref-for-something⑦②">format_flags</a> specified in <a data-link-type="biblio" href="#biblio-mp4-pcm" title="Information technology — MPEG audio technologies — Part 5: Uncompressed audio in MPEG-4 file format">[MP4-PCM]</a>. In other words, 0x01 indicates little-endian PCM sample format and 0x00 indicates big-endian PCM sample format.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="sample_size">sample_size<a class="self-link" href="#sample_size"></a></dfn> complies with <a data-link-type="dfn" href="https://www.iso.org/standard/77752.html#" id="ref-for-something⑦③">PCM_sample_size</a> specified in <a data-link-type="biblio" href="#biblio-mp4-pcm" title="Information technology — MPEG audio technologies — Part 5: Uncompressed audio in MPEG-4 file format">[MP4-PCM]</a>. In other words, it SHALL take a value from the set {16, 24, 32}.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="sample_rate">sample_rate</dfn> indicates the sample rate of the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①①">3D audio signal</a> in Hz. It SHALL take a value from the set {44.1k, 16k, 32k, 48k, 96k}.</p>
-   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑥">audio_frame()</a> is only one single mono or stereo PCM audio frame.</p>
+   <p>The format of <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑥">audio_frame</a> is only one single mono or stereo PCM audio frame.</p>
    <ul>
     <li data-md>
-     <p>If <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑦">audio_frame()</a> contains a stereo PCM audio frame, the i-th audio sample of the Left channel is followed by the i-th audio sample of the Right channel, and then the (i+1)-th audio sample of the Left channel is followed by the (i+1)-th audio sample of the Right channel, where i = 1, 2, ..., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame⑧">num_samples_per_frame</a> - 1.</p>
+     <p>If <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame⑦">audio_frame</a> contains a stereo PCM audio frame, the i-th audio sample of the Left channel is followed by the i-th audio sample of the Right channel, and then the (i+1)-th audio sample of the Left channel is followed by the (i+1)-th audio sample of the Right channel, where i = 1, 2, ..., <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame⑧">num_samples_per_frame</a> - 1.</p>
     <li data-md>
      <p>When more than one byte is used to represent a PCM sample, the byte order (i.e., its endianness) is indicated in <a data-link-type="dfn" href="#sample_format_flags" id="ref-for-sample_format_flags">sample_format_flags</a>.</p>
    </ul>
    <p>The sample rate used for computing offsets SHALL be <a data-link-type="dfn" href="#sample_rate" id="ref-for-sample_rate">sample_rate</a>.</p>
    <h2 class="heading settled" data-level="4" id="profiles"><span class="secno">4. </span><span class="content">Profiles</span><a class="self-link" href="#profiles"></a></h2>
    <p>The IA Profiles define a set of capabilities that are REQUIRED to parse, decode and process the corresponding <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑧">IA Sequence</a>.</p>
-   <p>IA decoders SHALL be able to parse all OBUs explicitly listed for this version of the specification. They can still encounter reserved OBUs that they SHOULD skip. This allows future versions of the specification to define new profiles that can be backward compatible with old profiles.</p>
+   <p>IA decoders SHALL be able to parse all OBUs explicitly listed for this version of the specification. They can still encounter <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu②">Reserved OBU</a>s that they SHOULD skip. This allows future versions of the specification to define new profiles that can be backward compatible with old profiles.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> In this section and subsections, the meaning of a unique OBU is that it is still unique if it only varies by the <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy③">obu_redundant_copy</a> flag.</p>
    <p>Common restrictions on the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑨">IA Sequence</a> for all profiles specified in this version of the specification:</p>
    <ul>
     <li data-md>
-     <p>The maximum size of an OBU (an obu_header followed by the OBU payload) SHALL be limited to \(2\text{MB}\) (i.e., \(2^{21}\) bytes). It implies that the maximum value of the <a data-link-type="dfn" href="#obu_size" id="ref-for-obu_size">obu_size</a> field SHALL be limited to \(2^{21} - 4\).</p>
+     <p>The maximum size of an OBU (an <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header④">OBU Header</a> followed by the OBU payload) SHALL be limited to \(2\text{MB}\) (i.e., \(2^{21}\) bytes). It implies that the maximum value of the <a data-link-type="dfn" href="#obu_size" id="ref-for-obu_size">obu_size</a> field SHALL be limited to \(2^{21} - 4\).</p>
     <li data-md>
      <p>There SHALL be only one unique set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①③">Descriptors</a> in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⓪">IA Sequence</a>. If the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①④">Descriptors</a> are repeated in the middle of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④①">IA Sequence</a>, all the OBUs in that set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑤">Descriptors</a> SHALL be marked as redundant (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy④">obu_redundant_copy</a> = 1).</p>
      <ul>
       <li data-md>
-       <p>When a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑥">Descriptors</a> is placed in the middle of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④②">IA Sequence</a>, it SHALL NOT be placed in the middle of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit③">Temporal Unit</a>. In other words, if <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑦">Descriptors</a> are placed mid-sequence, they SHALL be present only after the last OBU of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit④">Temporal Unit</a> and before the first OBU of the next <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑤">Temporal Unit</a>.</p>
+       <p>When a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑥">Descriptors</a> is placed in the middle of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④②">IA Sequence</a>, it SHALL NOT be placed in the middle of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit④">Temporal Unit</a>. In other words, if <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑦">Descriptors</a> are placed mid-sequence, they SHALL be present only after the last OBU of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑤">Temporal Unit</a> and before the first OBU of the next <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑥">Temporal Unit</a>.</p>
      </ul>
     <li data-md>
-     <p>There SHALL be only one unique <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu④">Codec Config OBU</a>.</p>
+     <p>There SHALL be only one unique <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑥">Codec Config OBU</a>.</p>
     <li data-md>
-     <p>Every <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦④">Audio Substream</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④③">IA Sequence</a> SHALL have the same start timestamp, SHALL consist of the same number of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②④">Audio Frame OBU</a>s, and SHALL have the same trimming information.</p>
+     <p>Every <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑦">Audio Substream</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④③">IA Sequence</a> SHALL have the same start timestamp, SHALL consist of the same number of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑦">Audio Frame OBU</a>s, and SHALL have the same trimming information.</p>
     <li data-md>
-     <p>Every <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑧">Parameter Substream</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④④">IA Sequence</a> SHALL have the same start timestamp as the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑤">Audio Substream</a> which the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑨">Parameter Substream</a> is applied to, and SHALL consist of the same number of <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑦">Parameter Block OBU</a>s.</p>
+     <p>Every <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②⑨">Parameter Substream</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④④">IA Sequence</a> SHALL have the same start timestamp as the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑧">Audio Substream</a> which the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⓪">Parameter Substream</a> is applied to, and SHALL consist of the same number of <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑤">Parameter Block OBU</a>s.</p>
      <ul>
       <li data-md>
-       <p>Every <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑧">Parameter Block OBU</a> SHALL have the same duration as its corresponding <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑤">Audio Frame OBU</a> under the same sample rate.</p>
+       <p>Every <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑥">Parameter Block OBU</a> SHALL have the same duration as its corresponding <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑧">Audio Frame OBU</a> under the same sample rate.</p>
        <ul>
         <li data-md>
-         <p>For example, when the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑥">Audio Frame OBU</a> has 960 audio samples at 48000 Hz, the duration of every <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu①⑨">Parameter Block OBU</a> SHALL be 960 units if the parameter sample rate is 48000 Hz, or 480 units if the parameter sample rate is 24000 Hz.</p>
+         <p>For example, when the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑨">Audio Frame OBU</a> has 960 audio samples at 48000 Hz, the duration of every <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑦">Parameter Block OBU</a> SHALL be 960 units if the parameter sample rate is 48000 Hz, or 480 units if the parameter sample rate is 24000 Hz.</p>
        </ul>
      </ul>
     <li data-md>
-     <p>In every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑥">Temporal Unit</a>, the start timestamp of every <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑦">Audio Frame OBU</a> SHALL be the same as its corresponding <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⓪">Parameter Block OBU</a>, if present.</p>
+     <p>In every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑦">Temporal Unit</a>, the start timestamp of every <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⓪">Audio Frame OBU</a> SHALL be the same as its corresponding <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑧">Parameter Block OBU</a>, if present.</p>
      <ul>
       <li data-md>
-       <p>There SHALL be no redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②①">Parameter Block OBU</a>s.</p>
+       <p>There SHALL be no redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑨">Parameter Block OBU</a>s.</p>
       <li data-md>
-       <p><a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②②">Parameter Block OBU</a>s SHALL come first and SHALL be followed by <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑧">Audio Frame OBU</a>s.</p>
+       <p><a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⓪">Parameter Block OBU</a>s SHALL come first and SHALL be followed by <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③①">Audio Frame OBU</a>s.</p>
      </ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes">num_sub_mixes</a> SHOULD be set to 1. Mix Presentation OBUs with <a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes①">num_sub_mixes</a> > 1 SHOULD be ignored.</p>
+     <p><a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes">num_sub_mixes</a> SHOULD be set to 1. <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑧">Mix Presentation OBU</a>s with <a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes①">num_sub_mixes</a> > 1 SHOULD be ignored.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements">num_audio_elements</a> SHOULD be set to 1 or 2. Mix Presentation OBUs with <a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements①">num_audio_elements</a> > 2 SHOULD be ignored.</p>
+     <p><a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements">num_audio_elements</a> SHOULD be set to 1 or 2. <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑨">Mix Presentation OBU</a>s with <a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements①">num_audio_elements</a> > 2 SHOULD be ignored.</p>
    </ul>
    <p class="note" role="note"><span class="marker">NOTE:</span> This behavior is to allow future versions of this specification to define new profiles that support a number of audio elements and/or a number of sub-mixes greater than those recommended in this profile, while still permitting streams compliant with these new profiles to be processed by parsers compliant with the profiles defined in this version of the specification.</p>
    <ul>
     <li data-md>
-     <p>When <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑦">num_layers</a> = 1, DemixingParamDefinition() for demixing MAY be present in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①③">Audio Element OBU</a> and IA decoders MAY use the (default) demixing parameter data for (dynamic) down-mixing.</p>
+     <p>When <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑦">num_layers</a> = 1, <a data-link-type="dfn" href="#demixingparamdefinition" id="ref-for-demixingparamdefinition③">DemixingParamDefinition()</a> for demixing MAY be present in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑥">Audio Element OBU</a> and IA decoders MAY use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data①">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data">default_demixing_info_parameter_data</a> for (dynamic) down-mixing.</p>
    </ul>
    <h3 class="heading settled" data-level="4.1" id="profiles-simple"><span class="secno">4.1. </span><span class="content">IA Simple Profile</span><a class="self-link" href="#profiles-simple"></a></h3>
    <p>This section specifies the conformance points of the simple profile.</p>
    <p>Restrictions on the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑤">IA Sequence</a>:</p>
    <ul>
     <li data-md>
-     <p>There SHALL be only one unique <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①④">Audio Element OBU</a>.</p>
+     <p>There SHALL be only one unique <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑦">Audio Element OBU</a>.</p>
     <li data-md>
-     <p>There SHALL NOT be any <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu②">Temporal Delimiter OBU</a>s present.</p>
+     <p>There SHALL NOT be any <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu④">Temporal Delimiter OBU</a>s present.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile②">additional_profile</a> SHALL be set to 0 to indicate that the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑥">IA Sequence</a> complies with this profile.</p>
     <li data-md>
@@ -3653,36 +3674,36 @@ <h3 class="heading settled" data-level="4.1" id="profiles-simple"><span class="s
     <li data-md>
      <p>They SHALL be able to handle up to 16 channels.</p>
     <li data-md>
-     <p>They SHALL be able to reconstruct one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⓪">Audio Element</a>.</p>
+     <p>They SHALL be able to reconstruct one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦③">Audio Element</a>.</p>
     <li data-md>
-     <p>They MAY use (default_)demixing_info_parameter_data to do down-mixing.</p>
+     <p>They MAY use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data②">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data①">default_demixing_info_parameter_data</a> to do down-mixing.</p>
    </ul>
    <h3 class="heading settled" data-level="4.2" id="profiles-base"><span class="secno">4.2. </span><span class="content">IA Base Profile</span><a class="self-link" href="#profiles-base"></a></h3>
    <p>This section specifies the conformance points of the base profile.</p>
    <p>Restrictions on the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑧">IA Sequence</a>:</p>
    <ul>
     <li data-md>
-     <p>There SHALL be at most two unique <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑤">Audio Element OBU</a>s at any one time.</p>
+     <p>There SHALL be at most two unique <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑧">Audio Element OBU</a>s at any one time.</p>
      <ul>
       <li data-md>
-       <p>There SHALL be at most one Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦①">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑧">num_layers</a> > 1 at any one time.</p>
+       <p>There SHALL be at most one Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦④">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑧">num_layers</a> > 1 at any one time.</p>
       <li data-md>
-       <p>There SHALL be at most one Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦②">Audio Element</a> at any one time.</p>
+       <p>There SHALL be at most one Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑤">Audio Element</a> at any one time.</p>
       <li data-md>
-       <p>In other words, only the following combinations of two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦③">Audio Element</a>s are allowed.</p>
+       <p>In other words, only the following combinations of two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑥">Audio Element</a>s are allowed.</p>
        <ul>
         <li data-md>
-         <p>Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦④">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑨">num_layers</a> = 1 + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑤">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①⓪">num_layers</a> = 1.</p>
+         <p>Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑦">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers⑨">num_layers</a> = 1 + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑧">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①⓪">num_layers</a> = 1.</p>
         <li data-md>
-         <p>Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑥">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①①">num_layers</a> = 1 + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑦">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①②">num_layers</a> > 1.</p>
+         <p>Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑨">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①①">num_layers</a> = 1 + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⓪">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①②">num_layers</a> > 1.</p>
         <li data-md>
-         <p>Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑧">Audio Element</a> + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦⑨">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①③">num_layers</a> = 1.</p>
+         <p>Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧①">Audio Element</a> + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧②">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①③">num_layers</a> = 1.</p>
         <li data-md>
-         <p>Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⓪">Audio Element</a> + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧①">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①④">num_layers</a> > 1.</p>
+         <p>Scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧③">Audio Element</a> + Channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧④">Audio Element</a> having <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①④">num_layers</a> > 1.</p>
        </ul>
      </ul>
     <li data-md>
-     <p>There MAY be <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu③">Temporal Delimiter OBU</a>s present. If present, the first OBU of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑦">Temporal Unit</a> SHALL be the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu④">Temporal Delimiter OBU</a>.</p>
+     <p>There MAY be <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑤">Temporal Delimiter OBU</a>s present. If present, the first OBU of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑧">Temporal Unit</a> SHALL be the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑥">Temporal Delimiter OBU</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile③">additional_profile</a> SHALL be set to 1 to indicate that the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑨">IA Sequence</a> complies with this profile.</p>
     <li data-md>
@@ -3693,25 +3714,25 @@ <h3 class="heading settled" data-level="4.2" id="profiles-base"><span class="sec
     <li data-md>
      <p>They SHALL be able to parse an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⓪">IA Sequence</a> with <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑦">primary_profile</a> = 0 or 1.</p>
     <li data-md>
-     <p>They SHALL be able to support the capabilities of the Simple Profile.</p>
+     <p>They SHALL be able to support the capabilities of the <a href="#profiles-simple">Simple Profile</a>.</p>
     <li data-md>
      <p>They SHALL be able to handle up to 18 channels.</p>
      <ul>
       <li data-md>
-       <p>The 18 channels limit applies to the sum of channels across all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧②">Audio Element</a>s in a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②①">Mix Presentation</a> before mixing.</p>
+       <p>The 18 channels limit applies to the sum of channels across all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑤">Audio Element</a>s in a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②③">Mix Presentation</a> before mixing.</p>
       <li data-md>
        <p>One example is a mix with 3rd-order Ambisonics (16 channels) + non-diegetic stereo (2 channels).</p>
      </ul>
     <li data-md>
-     <p>They SHALL be able to reconstruct two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧③">Audio Element</a>s.</p>
+     <p>They SHALL be able to reconstruct two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑥">Audio Element</a>s.</p>
     <li data-md>
-     <p>They SHALL be able to mix two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧④">Audio Element</a>s.</p>
+     <p>They SHALL be able to mix two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑦">Audio Element</a>s.</p>
    </ul>
    <h2 class="heading settled" data-level="5" id="standalone"><span class="secno">5. </span><span class="content">Standalone IAMF Representation</span><a class="self-link" href="#standalone"></a></h2>
    <p>This section details the order in which the OBUs are sequenced in a standalone IAMF representation.</p>
    <h3 class="heading settled" data-level="5.1" id="standalone-ia-sequence"><span class="secno">5.1. </span><span class="content">IA Sequence</span><a class="self-link" href="#standalone-ia-sequence"></a></h3>
    <p>An <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-sequence">IA Sequence</dfn> is composed of a series of OBUs in the sequence of a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑧">Descriptors</a> followed by their associated <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data②">IA Data</a>.</p>
-   <p>The <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑨">Descriptors</a> MAY additionally be repeated redundantly and as frequently as necessary. In this case, the <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑤">obu_redundant_copy</a> field in their OBU headers SHALL be set to 1. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤①">IA Sequence</a>, each OBU in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⓪">Descriptors</a> SHALL be regarded as a non-redundant OBU regardless of the value of its <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑥">obu_redundant_copy</a>.</p>
+   <p>The <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑨">Descriptors</a> MAY additionally be repeated redundantly and as frequently as necessary. In this case, the <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑤">obu_redundant_copy</a> field in their <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header⑤">OBU Header</a>s SHALL be set to 1. Within an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤①">IA Sequence</a>, each OBU in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⓪">Descriptors</a> SHALL be regarded as a non-redundant OBU regardless of the value of its <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑥">obu_redundant_copy</a>.</p>
    <p>The figure below shows an example of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤②">IA Sequence</a>.</p>
    <center><img height="445" src="images/IA sequence.png" style="width:100%; height:auto;" width="1430"></center>
    <center>
@@ -3721,36 +3742,36 @@ <h4 class="heading settled" data-level="5.1.1" id="standalone-descriptor-obus"><
     A set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②①">Descriptors</a> SHALL be placed in the following order regardless of where they appear in the bitstream: 
    <ol>
     <li data-md>
-     <p>One <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑥">IA Sequence Header OBU</a></p>
+     <p>One <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑧">IA Sequence Header OBU</a></p>
     <li data-md>
-     <p>All <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑤">Codec Config OBU</a>s</p>
+     <p>All <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑦">Codec Config OBU</a>s</p>
     <li data-md>
-     <p>All <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑥">Audio Element OBU</a>s</p>
+     <p>All <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑨">Audio Element OBU</a>s</p>
     <li data-md>
-     <p>All <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑤">Mix Presentation OBU</a>s</p>
+     <p>All <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⓪">Mix Presentation OBU</a>s</p>
    </ol>
    <h4 class="heading settled" data-level="5.1.2" id="standalone-iadata-obus"><span class="secno">5.1.2. </span><span class="content">IA Data OBUs</span><a class="self-link" href="#standalone-iadata-obus"></a></h4>
-   <p><a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data③">IA Data</a> consists of a sequence of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②⑨">Audio Frame OBU</a>s, <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②③">Parameter Block OBU</a>s and <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑤">Temporal Delimiter OBU</a>s (if present), according to the rules below:</p>
+   <p><a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data③">IA Data</a> consists of a sequence of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③②">Audio Frame OBU</a>s, <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③①">Parameter Block OBU</a>s and <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑦">Temporal Delimiter OBU</a>s (if present), according to the rules below:</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⓪">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②④">Parameter Block OBU</a>s SHALL be ordered by their implied timestamp in the timeline.</p>
+     <p><a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③③">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③②">Parameter Block OBU</a>s SHALL be ordered by their implied timestamp in the timeline.</p>
     <li data-md>
-     <p>If there are multiple <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③①">Audio Frame OBU</a>s that have the same implied start timestamp, they SHALL be grouped by <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑤">Audio Element</a>s.</p>
+     <p>If there are multiple <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③④">Audio Frame OBU</a>s that have the same implied start timestamp, they SHALL be grouped by <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑧">Audio Element</a>s.</p>
     <li data-md>
-     <p>A <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑥">Temporal Delimiter OBU</a> MAY be inserted at the beginning of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑧">Temporal Unit</a>.</p>
+     <p>A <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑧">Temporal Delimiter OBU</a> MAY be inserted at the beginning of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑨">Temporal Unit</a>.</p>
     <li data-md>
-     <p>If <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑦">Temporal Delimiter OBU</a>s are present, one of them SHALL be inserted at the beginning of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑨">Temporal Unit</a>.</p>
+     <p>If <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑨">Temporal Delimiter OBU</a>s are present, one of them SHALL be inserted at the beginning of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⓪">Temporal Unit</a>.</p>
    </ul>
-   <p>Additionally, the following constraints apply to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③②">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑤">Parameter Block OBU</a>s:</p>
+   <p>Additionally, the following constraints apply to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑤">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③③">Parameter Block OBU</a>s:</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③③">Audio Frame OBU</a>s SHALL be provided non-redundantly (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑦">obu_redundant_copy</a> = 0), such that for each <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑥">Audio Substream</a>, there are no two <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③④">Audio Frame OBU</a>s that are overlapping in time.</p>
+     <p><a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑥">Audio Frame OBU</a>s SHALL be provided non-redundantly (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑦">obu_redundant_copy</a> = 0), such that for each <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑨">Audio Substream</a>, there are no two <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑦">Audio Frame OBU</a>s that are overlapping in time.</p>
     <li data-md>
-     <p>Non-redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑥">Parameter Block OBU</a>s SHALL NOT provide data for overlapping time regions.</p>
+     <p>Non-redundant <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③④">Parameter Block OBU</a>s SHALL NOT provide data for overlapping time regions.</p>
    </ul>
    <h3 class="heading settled" data-level="5.2" id="standalone-iamf-configuration-changes"><span class="secno">5.2. </span><span class="content">IAMF Configuration Changes</span><a class="self-link" href="#standalone-iamf-configuration-changes"></a></h3>
    <p>If the IAMF configuration changes, a new set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②②">Descriptors</a> is REQUIRED. In that case, a new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤③">IA Sequence</a> of the complete set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②③">Descriptors</a> and their corresponding <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data④">IA Data</a> SHALL follow, in the same order as described above.</p>
-   <p>Each OBU in the first set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②④">Descriptors</a> of the new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤④">IA Sequence</a> SHALL be marked as non-redundant (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑧">obu_redundant_copy</a> = 0 in the OBU header).</p>
+   <p>Each OBU in the first set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②④">Descriptors</a> of the new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤④">IA Sequence</a> SHALL be marked as non-redundant (i.e., <a data-link-type="dfn" href="#obu_redundant_copy" id="ref-for-obu_redundant_copy⑧">obu_redundant_copy</a> = 0 in the <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header⑥">OBU Header</a>).</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> In a typical case, the OBUs in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑤">Descriptors</a> of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑤">IA Sequence</a> are all marked as non-redundant. When two <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑥">IA Sequence</a>s are concatenated, every OBU in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑥">Descriptors</a> of the second <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑦">IA Sequence</a> is marked as non-redundant.</p>
    <h2 class="heading settled" data-level="6" id="isobmff"><span class="secno">6. </span><span class="content">ISO-BMFF IAMF Encapsulation</span><a class="self-link" href="#isobmff"></a></h2>
    <h3 class="heading settled" data-level="6.1" id="brands"><span class="secno">6.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="#brands"></a></h3>
@@ -3799,7 +3820,7 @@ <h4 class="heading settled" data-level="6.2.2" id="isobmff-singletrack-basicenca
      <p>Sample Group</p>
      <ul>
       <li data-md>
-       <p>When the <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①③">codec_id</a> is set to <code>Opus</code> or <code>mp4a</code> in an <a data-link-type="dfn" href="#ia-track" id="ref-for-ia-track">IA Track</a>, every sample SHALL be associated with a sample group of the type <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⓪">roll</a>. The <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧①">roll_distance</a> value SHALL equal the value of the <a data-link-type="dfn" href="#audio_roll_distance" id="ref-for-audio_roll_distance">audio_roll_distance</a> field in the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑥">Codec Config OBU</a> stored in the <a data-link-type="dfn" href="#configobus" id="ref-for-configobus②">configOBUs</a> array in the sample entry.</p>
+       <p>When the <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①③">codec_id</a> is set to <code>Opus</code> or <code>mp4a</code> in an <a data-link-type="dfn" href="#ia-track" id="ref-for-ia-track">IA Track</a>, every sample SHALL be associated with a sample group of the type <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⓪">roll</a>. The <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧①">roll_distance</a> value SHALL equal the value of the <a data-link-type="dfn" href="#audio_roll_distance" id="ref-for-audio_roll_distance">audio_roll_distance</a> field in the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑧">Codec Config OBU</a> stored in the <a data-link-type="dfn" href="#configobus" id="ref-for-configobus②">configOBUs</a> array in the sample entry.</p>
      </ul>
     <li data-md>
      <p>Composition Time Stamp (CTS)</p>
@@ -3827,13 +3848,13 @@ <h4 class="heading settled" data-level="6.2.3" id="iasampleentry-section"><span
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="configobus">configOBUs</dfn> SHALL contain the following OBUs in order.</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑦">IA Sequence Header OBU</a></p>
+     <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑨">IA Sequence Header OBU</a></p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑦">Codec Config OBU</a></p>
+     <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑨">Codec Config OBU</a></p>
     <li data-md>
-     <p>One or more <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑦">Audio Element OBU</a>s</p>
+     <p>One or more <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⓪">Audio Element OBU</a>s</p>
     <li data-md>
-     <p>One or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑥">Mix Presentation OBU</a>s</p>
+     <p>One or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①①">Mix Presentation OBU</a>s</p>
    </ul>
    <h4 class="heading settled" data-level="6.2.4" id="iasampleformat"><span class="secno">6.2.4. </span><span class="content">IA Sample Format</span><a class="self-link" href="#iasampleformat"></a></h4>
    <p><b>Syntax</b></p>
@@ -3842,17 +3863,17 @@ <h4 class="heading settled" data-level="6.2.4" id="iasampleformat"><span class="
 }
 </pre>
    <p><b>Semantics</b></p>
-   <p><dfn data-dfn-type="dfn" data-noexport id="obus">obus<a class="self-link" href="#obus"></a></dfn> is a sequence of OBUs representing one <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⓪">Temporal Unit</a>.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="obus">obus<a class="self-link" href="#obus"></a></dfn> is a sequence of OBUs representing one <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①①">Temporal Unit</a>.</p>
    <p>For tracks using the <a data-link-type="dfn" href="#iasampleentry" id="ref-for-iasampleentry①">IASampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-sample">IA Sample</dfn> has the following constraints:</p>
    <ul>
     <li data-md>
      <p>The <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑧">stss</a> box SHALL NOT be present, meaning that all <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample⑧">IA Sample</a>s are marked as sync samples.</p>
     <li data-md>
-     <p>One <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample⑨">IA Sample</a> SHALL be one <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①①">Temporal Unit</a> and SHALL NOT contain the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑧">Temporal Delimiter OBU</a>.</p>
+     <p>One <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample⑨">IA Sample</a> SHALL be one <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①②">Temporal Unit</a> and SHALL NOT contain the <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⓪">Temporal Delimiter OBU</a>.</p>
     <li data-md>
-     <p>The decode duration of an <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①⓪">IA Sample</a> SHALL equal the duration of the underlying <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①②">Temporal Unit</a> (i.e., the decode duration of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑤">Audio Frame OBU</a>).</p>
+     <p>The decode duration of an <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①⓪">IA Sample</a> SHALL equal the duration of the underlying <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①③">Temporal Unit</a> (i.e., the decode duration of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑧">Audio Frame OBU</a>).</p>
    </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Per the restriction of the profiles carried in an <a data-link-type="dfn" href="#ia-track" id="ref-for-ia-track①">IA Track</a>, all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑥">Audio Frame OBU</a>s in an <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①①">IA Sample</a> have the same duration and have the same trimming information. If <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑦">Audio Frame OBU</a>s in the <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①②">IA Sample</a> contain trimming information, the corresponding audio samples are removed from the presentation using edit list information.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Per the restriction of the profiles carried in an <a data-link-type="dfn" href="#ia-track" id="ref-for-ia-track①">IA Track</a>, all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑨">Audio Frame OBU</a>s in an <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①①">IA Sample</a> have the same duration and have the same trimming information. If <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⓪">Audio Frame OBU</a>s in the <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①②">IA Sample</a> contain trimming information, the corresponding audio samples are removed from the presentation using edit list information.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> In typical cases, when a track contains a single <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥④">IA Sequence</a>, trimming can only happen at the beginning or the end of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑤">IA Sequence</a>. Therefore, the edit list can describe the start and end trimming with a single edit entry. A track storing consecutive <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑥">IA Sequence</a>s may need multiple edits in the edit list.</p>
    <h3 class="heading settled" data-level="6.3" id="codecsparameter"><span class="secno">6.3. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparameter"></a></h3>
    <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-something⑧⑨">codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc-6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for Bucket Media Types">[RFC-6381]</a> for ISO Media tracks. The codecs parameter string for <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①④">codec_id</a> SHALL be:</p>
@@ -3899,12 +3920,12 @@ <h4 class="heading settled" data-level="6.4.1" id="isobmff-decapsulation-singlet
     <li data-md>
      <p>The <a data-link-type="dfn" href="#configobus" id="ref-for-configobus③">configOBUs</a> from the <a data-link-type="dfn" href="#iasampleentry" id="ref-for-iasampleentry②">IASampleEntry</a> are placed at the beginning of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑧">IA Sequence</a>. These are the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑨">Descriptors</a>.</p>
     <li data-md>
-     <p>Next, place the OBUs from the j = 1, 2, ..., m-th <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①③">IA Sample</a>s associated with the <a data-link-type="dfn" href="#iasampleentry" id="ref-for-iasampleentry③">IASampleEntry</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑨">IA Sequence</a>, in order. These form the j = 1, 2, ..., m-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①③">Temporal Unit</a>s.</p>
+     <p>Next, place the OBUs from the j = 1, 2, ..., m-th <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①③">IA Sample</a>s associated with the <a data-link-type="dfn" href="#iasampleentry" id="ref-for-iasampleentry③">IASampleEntry</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑨">IA Sequence</a>, in order. These form the j = 1, 2, ..., m-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①④">Temporal Unit</a>s.</p>
      <ul>
       <li data-md>
-       <p>If it is desirable to have <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu⑨">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⓪">IA Sequence</a>, insert a <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⓪">Temporal Delimiter OBU</a> in front of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①④">Temporal Unit</a>.</p>
+       <p>If it is desirable to have <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①①">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⓪">IA Sequence</a>, insert a <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①②">Temporal Delimiter OBU</a> in front of every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑤">Temporal Unit</a>.</p>
       <li data-md>
-       <p>Otherwise, do not insert any <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①①">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦①">IA Sequence</a>.</p>
+       <p>Otherwise, do not insert any <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①③">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦①">IA Sequence</a>.</p>
      </ul>
    </ol>
    <h4 class="heading settled" data-level="6.4.2" id="isobmff-decapsulation-singletrack-trimming"><span class="secno">6.4.2. </span><span class="content">Handling Trimming Information</span><a class="self-link" href="#isobmff-decapsulation-singletrack-trimming"></a></h4>
@@ -3916,14 +3937,14 @@ <h4 class="heading settled" data-level="6.4.2" id="isobmff-decapsulation-singlet
    <p>As depicted in the figure above,</p>
    <ul>
     <li data-md>
-     <p>The IAMF-ISO-BMFF parser passes the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a>, PTS1 and <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①④">IA Samples</a> (or <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑤">Temporal Unit</a>s) to the IAMF decoder.</p>
+     <p>The IAMF-ISO-BMFF parser passes the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a>, PTS1 and <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①④">IA Samples</a> (or <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑥">Temporal Unit</a>s) to the IAMF decoder.</p>
     <li data-md>
      <p>The IAMF-ISO-BMFF parser passes PTS1 and the trimming information to the IAMF-ISO-BMFF player. (This is optional if the IAMF decoder trims the audio samples.)</p>
     <li data-md>
      <p>The IAMF decoder passes PTS and the audio samples after decoding to the IAMF-ISO-BMFF player.</p>
      <ul>
       <li data-md>
-       <p>If the IAMF decoder trims the audio samples based on the trimming information within the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑧">Audio Frame OBU</a>s, then the IAMF decoder passes PTS2 and the audio samples after trimming.</p>
+       <p>If the IAMF decoder trims the audio samples based on the trimming information within the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④①">Audio Frame OBU</a>s, then the IAMF decoder passes PTS2 and the audio samples after trimming.</p>
       <li data-md>
        <p>If the IAMF decoder does not trim, then the IAMF decoder passes PTS1 and the audio samples before trimming.</p>
      </ul>
@@ -3937,13 +3958,13 @@ <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7
     <li data-md>
      <p>Parsing OBUs to obtain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③①">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data⑤">IA Data</a>.</p>
     <li data-md>
-     <p>Selecting a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②②">Mix Presentation</a> to use.</p>
+     <p>Selecting a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②④">Mix Presentation</a> to use.</p>
      <ul>
       <li data-md>
        <p>Details are provided in <a href="#processing-mixpresentation-selection">§ 7.3.1 Selecting a Mix Presentation</a>.</p>
      </ul>
     <li data-md>
-     <p>Decoding and reconstructing one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑥">Audio Element</a>s that are referenced by the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②③">Mix Presentation</a>, and used in the remainder of the steps below.</p>
+     <p>Decoding and reconstructing one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑨">Audio Element</a>s that are referenced by the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑤">Mix Presentation</a>, and used in the remainder of the steps below.</p>
      <ul>
       <li data-md>
        <p>Ambisonics decoding is described in <a href="#processing-ambisonics">§ 7.1 Ambisonics Decoding and Reconstruction</a>.</p>
@@ -3951,25 +3972,25 @@ <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7
        <p>Scalable Channel Audio decoding is described in <a href="#processing-scalablechannelaudio">§ 7.2 Scalable Channel Audio Decoding and Reconstruction</a>.</p>
      </ul>
     <li data-md>
-     <p>Rendering each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑦">Audio Element</a> to the playback layout.</p>
+     <p>Rendering each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⓪">Audio Element</a> to the playback layout.</p>
      <ul>
       <li data-md>
        <p>Details are provided in <a href="#processing-mixpresentation-rendering">§ 7.3.2 Rendering an Audio Element</a>.</p>
      </ul>
     <li data-md>
-     <p>Applying mixing parameters to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑧">Audio Element</a>.</p>
+     <p>Applying mixing parameters to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨①">Audio Element</a>.</p>
      <ul>
       <li data-md>
        <p>Details are provided in <a href="#processing-mixpresentation-mixing">§ 7.3.3 Mixing Audio Elements</a>.</p>
      </ul>
     <li data-md>
-     <p>Synchronizing and then summing all rendered and individually processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑨">Audio Element</a>s.</p>
+     <p>Synchronizing and then summing all rendered and individually processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨②">Audio Element</a>s.</p>
      <ul>
       <li data-md>
        <p>Details are provided in <a href="#processing-mixpresentation-mixing">§ 7.3.3 Mixing Audio Elements</a>.</p>
      </ul>
     <li data-md>
-     <p>Applying further mixing parameters to the mixed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⓪">Audio Element</a>s.</p>
+     <p>Applying further mixing parameters to the mixed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨③">Audio Element</a>s.</p>
      <ul>
       <li data-md>
        <p>Details are provided in <a href="#processing-mixpresentation-mixing">§ 7.3.3 Mixing Audio Elements</a>.</p>
@@ -3981,7 +4002,7 @@ <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7
        <p>Details are provided in <a href="#processing-post">§ 7.5 Post Processing (Informative)</a>.</p>
      </ul>
    </ol>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The IA decoder MAY choose to lazily parse OBUs to avoid unnecessarily parsing OBUs that are not used by the selected <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②④">Mix Presentation</a>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The IA decoder MAY choose to lazily parse OBUs to avoid unnecessarily parsing OBUs that are not used by the selected <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑥">Mix Presentation</a>.</p>
    <p>The figure below depicts an example IA decoder architecture with modules that perform the steps above.</p>
    <center><img height="700" src="images/IA Decoder Configuration.png" style="width:100%; height:auto;" width="1908"></center>
    <center>
@@ -3989,15 +4010,15 @@ <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7
    </center>
    <ul>
     <li data-md>
-     <p>The OBU parser depacketizes the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦③">IA Sequence</a> to output the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③②">Descriptor</a>s, <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑦">Audio Substream</a>s and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⓪">Parameter Substream</a>s.</p>
+     <p>The OBU parser depacketizes the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦③">IA Sequence</a> to output the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③②">Descriptor</a>s, <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⓪">Audio Substream</a>s and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③①">Parameter Substream</a>s.</p>
     <li data-md>
-     <p>The Codec Decoder for each <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑧">Audio Substream</a> outputs the decoded channels.</p>
+     <p>The Codec Decoder for each <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧①">Audio Substream</a> outputs the decoded channels.</p>
     <li data-md>
-     <p>The Audio Element Renderer reconstructs the <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①②">3D audio signal</a> from decoded channels of Codec Decoders according to <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨①">Audio Element</a> type (specified <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑧">Audio Element OBU</a>), and renders the audio channels to the playback layout.</p>
+     <p>The Audio Element Renderer reconstructs the <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①②">3D audio signal</a> from decoded channels of Codec Decoders according to <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨④">Audio Element</a> type (specified <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②①">Audio Element OBU</a>), and renders the audio channels to the playback layout.</p>
     <li data-md>
-     <p>The Synchronizer synchronizes all rendered and individually processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨②">Audio Element</a>s.</p>
+     <p>The Synchronizer synchronizes all rendered and individually processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑤">Audio Element</a>s.</p>
     <li data-md>
-     <p>The Mixer sums the synchronized <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨③">Audio Element</a>s and applies further mixing parameters.</p>
+     <p>The Mixer sums the synchronized <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑥">Audio Element</a>s and applies further mixing parameters.</p>
     <li data-md>
      <p>Then, Post-Processor outputs the <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑨">Immersive Audio</a> for playback after performs loudness normalization and peak-limiting.</p>
    </ul>
@@ -4010,11 +4031,11 @@ <h3 class="heading settled" data-level="7.1" id="processing-ambisonics"><span cl
    </center>
    <ul>
     <li data-md>
-     <p>The OBU parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦⑨">Audio Substream</a>s for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨④">Audio Element</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦④">IA sequence</a>.</p>
+     <p>The OBU parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧②">Audio Substream</a>s for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑦">Audio Element</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦④">IA sequence</a>.</p>
     <li data-md>
-     <p>The OBU parser SHALL provide the <a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping">channel_mapping</a> or <a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix">demixing_matrix</a> information (according to <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode①">ambisonics_mode</a>) to the Channel Mapping/Demixing Matrix module.</p>
+     <p>The OBU parser SHALL provide the <a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping">channel_mapping</a> or <a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix">demixing_matrix</a> information (according to <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode③">ambisonics_mode</a>) to the Channel Mapping/Demixing Matrix module.</p>
     <li data-md>
-     <p>The Codec Decoder SHALL generate the decoded PCM channels from the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⓪">Audio Substream</a>.</p>
+     <p>The Codec Decoder SHALL generate the decoded PCM channels from the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧③">Audio Substream</a>.</p>
      <ul>
       <li data-md>
        <p>The channels SHALL have the same order as the originally transmitted order of the coded channels.</p>
@@ -4034,10 +4055,10 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
    <center>
     <figcaption>Scalable Channel Audio Decoding and Reconstruction Flowchart</figcaption>
    </center>
-   <p>For a given loudspeaker layout (i.e., CL #i) among the list of <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①④">loudspeaker_layout</a>s in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config③">scalable_channel_layout_config</a>,</p>
+   <p>For a given loudspeaker layout (i.e., CL #i) among the list of <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①④">loudspeaker_layout</a>s in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config①">scalable_channel_layout_config</a>,</p>
    <ul>
     <li data-md>
-     <p>The OBU Parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧①">Audio Substream</a>s for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⓪">Channel Group</a> #1 to <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④①">Channel Group</a> #i and pass them to the Codec Decoder, along with <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①②">decoder_config</a>.</p>
+     <p>The OBU Parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧④">Audio Substream</a>s for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④①">Channel Group</a> #1 to <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④②">Channel Group</a> #i and pass them to the Codec Decoder, along with <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑤">decoder_config</a>.</p>
     <li data-md>
      <p>The Codec Decoder SHALL output the decoded PCM channels.</p>
      <ul>
@@ -4050,7 +4071,7 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
      <p>For scalable audio (i.e., i > 1), the decoded PCM channels are further processed as:</p>
      <ul>
       <li data-md>
-       <p>When <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag">output_gain_is_present_flag</a>(j) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④②">Channel Group</a> #j (j = 1, 2, ..., i-1) is set to 1, the Gain module SHALL apply <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain④">output_gain</a>(j) to all audio samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④③">Channel Group</a> #j indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags②">output_gain_flag</a>(j).</p>
+       <p>When <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag">output_gain_is_present_flag</a>(j) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④③">Channel Group</a> #j (j = 1, 2, ..., i-1) is set to 1, the Gain module SHALL apply <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain④">output_gain</a>(j) to all audio samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④④">Channel Group</a> #j indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags②">output_gain_flag</a>(j).</p>
       <li data-md>
        <p>The De-Mixer SHALL output de-mixed PCM channels for CL #i generated through de-mixing of the mixed channels from the Gain module by using non-mixed channels and demixing parameters for each frame.</p>
       <li data-md>
@@ -4061,7 +4082,7 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
    </ul>
    <p>The following sections (<a href="#processing-scalablechannelaudio-gain">§ 7.2.1 Gain</a>, <a href="#processing-scalablechannelaudio-demixer">§ 7.2.2 De-mixer</a> and <a href="#processing-scalablechannelaudio-recongain">§ 7.2.3 Recon Gain</a>) are only needed for decoding scalable audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①⑥">num_layers</a> > 1.</p>
    <h4 class="heading settled" data-level="7.2.1" id="processing-scalablechannelaudio-gain"><span class="secno">7.2.1. </span><span class="content">Gain</span><a class="self-link" href="#processing-scalablechannelaudio-gain"></a></h4>
-   <p>The Gain module is the mirror process of the Attenuation module (described in <a href="#iamfgeneration-scalablechannelaudio">§ 8.2 Scalable Channel Audio Encoding</a>). It recovers the reduced sample values using <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑤">output_gain</a>(i) when its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag①">output_gain_is_present_flag</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④④">Channel Group</a> #i is set to 1. When its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag②">output_gain_is_present_flag</a>(i) is set to 0, then this module SHALL be bypassed for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑤">Channel Group</a> #i. The value of <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑥">output_gain</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑥">Channel Group</a> #i SHALL be applied to all samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑦">Channel Group</a> #i, where a mixed channel means the channel created by mixing multiple channels of an input channel audio when generating <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio">down-mixed audio</a> from the input channel audio (i.e., the channel audio for CL #n).</p>
+   <p>The Gain module is the mirror process of the Attenuation module (described in <a href="#iamfgeneration-scalablechannelaudio">§ 8.2 Scalable Channel Audio Encoding</a>). It recovers the reduced sample values using <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑤">output_gain</a>(i) when its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag①">output_gain_is_present_flag</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑤">Channel Group</a> #i is set to 1. When its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag②">output_gain_is_present_flag</a>(i) is set to 0, then this module SHALL be bypassed for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑥">Channel Group</a> #i. The value of <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑥">output_gain</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑦">Channel Group</a> #i SHALL be applied to all samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑧">Channel Group</a> #i, where a mixed channel means the channel created by mixing multiple channels of an input channel audio when generating <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio">down-mixed audio</a> from the input channel audio (i.e., the channel audio for CL #n).</p>
    <p>To apply the gain, an implementation SHALL use the following:</p>
    <p>\[
 \text{sample} =	\text{sample} \times 10^{g}
@@ -4169,7 +4190,7 @@ <h4 class="heading settled" data-level="7.2.3" id="processing-scalablechannelaud
    <p><a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑤">recon_gain</a> SHALL only be applied to all audio samples of the de-mixed channels from the De-mixer module.</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑤">recon_gain_info_parameter_data</a> indicates each channel of CL #i to which <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑥">recon_gain</a> needs to be applied and provides the <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑦">recon_gain</a> value for each frame of the channel.</p>
+     <p><a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data④">recon_gain_info_parameter_data</a> indicates each channel of CL #i to which <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑥">recon_gain</a> needs to be applied and provides the <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑦">recon_gain</a> value for each frame of the channel.</p>
      <ul>
       <li data-md>
        <p>\(\text{sample}(k, i) = \text{sample}(k, i) \times \text{smoothed_recon_gain}(k, i)\), where \(k\) is the frame index and \(i\) is the sample index of the frame.</p>
@@ -4200,14 +4221,14 @@ <h4 class="heading settled" data-level="7.2.3" id="processing-scalablechannelaud
      <p>When <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id②①">codec_id</a> is set to <code>mp4a</code>: \(\text{olen} = 64\).</p>
    </ul>
    <h3 class="heading settled" data-level="7.3" id="processing-mixpresentation"><span class="secno">7.3. </span><span class="content">Mix Presentation</span><a class="self-link" href="#processing-mixpresentation"></a></h3>
-   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑤">IA Sequence</a> MAY contain more than one <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑤">Mix Presentation</a>. <a href="#processing-mixpresentation-selection">§ 7.3.1 Selecting a Mix Presentation</a> details how a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑥">Mix Presentation</a> SHOULD be selected from multiple of them.</p>
-   <p>A <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑦">Mix Presentation</a> specifies how to render, process and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑤">Audio Element</a>s. Each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑥">Audio Element</a> SHALL first be individually rendered and processed before mixing. Then, any additional processing specified by <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config①">output_mix_config</a> SHALL be applied to the mixed audio signal in order to generate the final output audio for playback. <a href="#processing-mixpresentation-rendering">§ 7.3.2 Rendering an Audio Element</a> details how each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑦">Audio Element</a> SHOULD be rendered, while <a href="#processing-mixpresentation-mixing">§ 7.3.3 Mixing Audio Elements</a> details how the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑧">Audio Element</a>s SHALL be processed and mixed.</p>
+   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑤">IA Sequence</a> MAY contain more than one <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑦">Mix Presentation</a>. <a href="#processing-mixpresentation-selection">§ 7.3.1 Selecting a Mix Presentation</a> details how a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑧">Mix Presentation</a> SHOULD be selected from multiple of them.</p>
+   <p>A <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑨">Mix Presentation</a> specifies how to render, process and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑧">Audio Element</a>s. Each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑨">Audio Element</a> SHALL first be individually rendered and processed before mixing. Then, any additional processing specified by <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config">output_mix_config</a> SHALL be applied to the mixed audio signal in order to generate the final output audio for playback. <a href="#processing-mixpresentation-rendering">§ 7.3.2 Rendering an Audio Element</a> details how each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⓪">Audio Element</a> SHOULD be rendered, while <a href="#processing-mixpresentation-mixing">§ 7.3.3 Mixing Audio Elements</a> details how the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪①">Audio Element</a>s SHALL be processed and mixed.</p>
    <p>As stated in <a href="#architecture">§ 2.2 Architecture</a>, specific renderers are out of scope. The examples provided are informative.</p>
    <h4 class="heading settled" data-level="7.3.1" id="processing-mixpresentation-selection"><span class="secno">7.3.1. </span><span class="content">Selecting a Mix Presentation</span><a class="self-link" href="#processing-mixpresentation-selection"></a></h4>
-   <p>When an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑥">IA Sequence</a> contains multiple <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑧">Mix Presentation</a>s, the IA parser SHOULD select the appropriate <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②⑨">Mix Presentation</a> in the following order.</p>
+   <p>When an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑥">IA Sequence</a> contains multiple <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③⓪">Mix Presentation</a>s, the IA parser SHOULD select the appropriate <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③①">Mix Presentation</a> in the following order.</p>
    <ol>
     <li data-md>
-     <p>If there are any user-selectable mixes, the IA parser SHOULD select the mix, or mixes, that match the user’s preferences. An example might be a mix with a specific language. <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③⓪">Mix Presentation</a>s MAY use <a data-link-type="dfn" href="#mix_presentation_friendly_label" id="ref-for-mix_presentation_friendly_label①">mix_presentation_friendly_label</a> to describe such mixes.</p>
+     <p>If there are any user-selectable mixes, the IA parser SHOULD select the mix, or mixes, that match the user’s preferences. An example might be a mix with a specific language. <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③②">Mix Presentation</a>s MAY use <a data-link-type="dfn" href="#mix_presentation_friendly_label" id="ref-for-mix_presentation_friendly_label①">mix_presentation_friendly_label</a> to describe such mixes.</p>
     <li data-md>
      <p>If there is more than one valid mix remaining, the IA parser SHOULD select an appropriate mix for rendering, in the following order.</p>
      <ol>
@@ -4227,12 +4248,12 @@ <h4 class="heading settled" data-level="7.3.1" id="processing-mixpresentation-se
         <li data-md>
          <p>If there is a mix with a <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout⑨">loudness_layout</a> that matches the playback loudspeaker layout, it SHOULD be selected. If there is more than one matching mix, the first one SHOULD be selected.</p>
         <li data-md>
-         <p>If there is no such mix, select the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③①">Mix Presentation</a> with the highest available <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⓪">loudness_layout</a>.</p>
+         <p>If there is no such mix, select the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③③">Mix Presentation</a> with the highest available <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⓪">loudness_layout</a>.</p>
        </ol>
      </ol>
    </ol>
    <h4 class="heading settled" data-level="7.3.2" id="processing-mixpresentation-rendering"><span class="secno">7.3.2. </span><span class="content">Rendering an Audio Element</span><a class="self-link" href="#processing-mixpresentation-rendering"></a></h4>
-   <p>This specification supports the rendering of either a channel-based or scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨⑨">Audio Element</a> to either a target loudspeaker layout or binaurally, to headphones.</p>
+   <p>This specification supports the rendering of either a channel-based or scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪②">Audio Element</a> to either a target loudspeaker layout or binaurally, to headphones.</p>
    <p>In this section, for a given x.y.z layout, the next highest layout x'.y'.z' means that x', y', and z' are greater than or equal to x, y, and z, respectively.</p>
    <table class="def">
     <tbody>
@@ -4258,15 +4279,15 @@ <h4 class="heading settled" data-level="7.3.2" id="processing-mixpresentation-re
       <td><a href="#processing-mixpresentation-rendering-a2b">§ 7.3.2.4 Rendering a Scene-Based Audio Element to Headphones (Informative)</a>
    </table>
    <h5 class="heading settled" data-level="7.3.2.1" id="processing-mixpresentation-rendering-m2l"><span class="secno">7.3.2.1. </span><span class="content">Rendering a Channel-Based Audio Element to Loudspeakers</span><a class="self-link" href="#processing-mixpresentation-rendering-m2l"></a></h5>
-   <p>This section defines the renderer to use, given a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⓪">Audio Element</a> and a loudspeaker playback layout.</p>
+   <p>This section defines the renderer to use, given a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪③">Audio Element</a> and a loudspeaker playback layout.</p>
    <ul>
     <li data-md>
      <p>The input layout (x.y.z) of the IA renderer is set as follows:</p>
      <ul>
       <li data-md>
-       <p>If <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⓪">num_layers</a> = 1, use the <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑥">loudspeaker_layout</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪①">Audio Element</a>.</p>
+       <p>If <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⓪">num_layers</a> = 1, use the <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑥">loudspeaker_layout</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪④">Audio Element</a>.</p>
       <li data-md>
-       <p>Else, if there is an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪②">Audio Element</a> with a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑦">loudspeaker_layout</a> that matches the playback layout, use it.</p>
+       <p>Else, if there is an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑤">Audio Element</a> with a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑦">loudspeaker_layout</a> that matches the playback layout, use it.</p>
       <li data-md>
        <p>Else, use the next highest available layout from all available <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑧">loudspeaker_layout</a>s.</p>
      </ul>
@@ -4276,14 +4297,14 @@ <h5 class="heading settled" data-level="7.3.2.1" id="processing-mixpresentation-
      <p>The IA renderer is selected according to the following rules:</p>
      <ul>
       <li data-md>
-       <p>If DemixingParamDefinition() is not present, render according to <a href="#processing-mixpresentation-rendering-m2l-withoutdemixinfo">§ 7.3.2.1.1 Rendering Without Demixing Info</a>.</p>
+       <p>If <a data-link-type="dfn" href="#demixingparamdefinition" id="ref-for-demixingparamdefinition④">DemixingParamDefinition()</a> is not present, render according to <a href="#processing-mixpresentation-rendering-m2l-withoutdemixinfo">§ 7.3.2.1.1 Rendering Without Demixing Info</a>.</p>
       <li data-md>
-       <p>Else, if the playback layout matches a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑨">loudspeaker_layout</a> which can be generated from the highest loudspeaker layout of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪③">Audio Element</a> according to <a href="#iamfgeneration-scalablechannelaudio-channellayoutgenerationrule">§ 10.2.3 Annex B-3: Channel Layout Generation Rule (Normative)</a>,</p>
+       <p>Else, if the playback layout matches a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①⑨">loudspeaker_layout</a> which can be generated from the highest loudspeaker layout of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑥">Audio Element</a> according to <a href="#iamfgeneration-scalablechannelaudio-channellayoutgenerationrule">§ 10.2.3 Annex B-3: Channel Layout Generation Rule (Normative)</a>,</p>
        <ul>
         <li data-md>
-         <p>If the playback layout has height channels, use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data②">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data">default_demixing_info_parameter_data</a>.</p>
+         <p>If the playback layout has height channels, use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data③">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data②">default_demixing_info_parameter_data</a>.</p>
         <li data-md>
-         <p>Else, if the input layout does not have height channels, use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data③">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data①">default_demixing_info_parameter_data</a>.</p>
+         <p>Else, if the input layout does not have height channels, use <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data④">demixing_info_parameter_data</a> or <a data-link-type="dfn" href="#default_demixing_info_parameter_data" id="ref-for-default_demixing_info_parameter_data③">default_demixing_info_parameter_data</a>.</p>
         <li data-md>
          <p>Else, the EAR Direct Speakers renderer (<a data-link-type="biblio" href="#biblio-itu-2127-0" title="Audio Definition Model renderer for advanced sound systems">[ITU-2127-0]</a>) can be used.</p>
        </ul>
@@ -4321,14 +4342,14 @@ <h6 class="heading settled" data-level="7.3.2.1.1" id="processing-mixpresentatio
      </ul>
    </ul>
    <h6 class="heading settled" data-level="7.3.2.1.2" id="processing-mixpresentation-rendering-m2l-configureear"><span class="secno">7.3.2.1.2. </span><span class="content">Configuring the EAR Direct Speakers Renderer (Informative)</span><a class="self-link" href="#processing-mixpresentation-rendering-m2l-configureear"></a></h6>
-   <p>If the EAR Direct Speakers renderer is used, the following is provided for each audio channel of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪④">Audio Element</a>:</p>
+   <p>If the EAR Direct Speakers renderer is used, the following is provided for each audio channel of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑦">Audio Element</a>:</p>
    <ul>
     <li data-md>
-     <p>speaker label: the label of the speaker position, using the same convention as <a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2051-3-202205-I!!PDF-E.pdf#" id="ref-for-something⑨⓪">SP Label</a> in <a data-link-type="biblio" href="#biblio-itu-2051-3" title="Advance sound system for programme production">[ITU-2051-3]</a>. This is defined for each audio channel of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑤">Audio Element</a> based on the information from <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②⓪">loudspeaker_layouts</a>.</p>
+     <p>speaker label: the label of the speaker position, using the same convention as <a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2051-3-202205-I!!PDF-E.pdf#" id="ref-for-something⑨⓪">SP Label</a> in <a data-link-type="biblio" href="#biblio-itu-2051-3" title="Advance sound system for programme production">[ITU-2051-3]</a>. This is defined for each audio channel of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑧">Audio Element</a> based on the information from <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②⓪">loudspeaker_layouts</a>.</p>
    </ul>
    <p>In <a data-link-type="biblio" href="#biblio-itu-2051-3" title="Advance sound system for programme production">[ITU-2051-3]</a>, an LFE audio channel can be identified either by an explicit label or its frequency content. In this specification, the LFE channel is identified based on the explicit label only, given by <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②①">loudspeaker_layout</a>.</p>
    <h5 class="heading settled" data-level="7.3.2.2" id="processing-mixpresentation-rendering-a2l"><span class="secno">7.3.2.2. </span><span class="content">Rendering a Scene-Based Audio Element to Loudspeakers (Informative)</span><a class="self-link" href="#processing-mixpresentation-rendering-a2l"></a></h5>
-   <p>This section provides guidelines about the renderer to use, given a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑥">Audio Element</a> and a loudspeaker playback layout.</p>
+   <p>This section provides guidelines about the renderer to use, given a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑨">Audio Element</a> and a loudspeaker playback layout.</p>
    <ul>
     <li data-md>
      <p>The input layout of the IA renderer is set to Ambisonics.</p>
@@ -4362,37 +4383,37 @@ <h5 class="heading settled" data-level="7.3.2.2" id="processing-mixpresentation-
 \end{aligned}
 \]</p>
    <h5 class="heading settled" data-level="7.3.2.3" id="processing-mixpresentation-rendering-m2b"><span class="secno">7.3.2.3. </span><span class="content">Rendering a Channel-Based Audio Element to Headphones (Informative)</span><a class="self-link" href="#processing-mixpresentation-rendering-m2b"></a></h5>
-   <p>Given a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑦">Audio Element</a> and headphones playback, the Binaural EBU ADM Direct Speaker renderer <a data-link-type="biblio" href="#biblio-ebu-tech-3396" title="BINAURAL EBU ADM RENDERER (BEAR) FOR OBJECT-BASED SOUND OVER HEADPHONES">[EBU-Tech-3396]</a> can be used. The highest layout provided in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config④">scalable_channel_layout_config</a> can be used as the input to the renderer.</p>
+   <p>Given a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⓪">Audio Element</a> and headphones playback, the Binaural EBU ADM Direct Speaker renderer <a data-link-type="biblio" href="#biblio-ebu-tech-3396" title="BINAURAL EBU ADM RENDERER (BEAR) FOR OBJECT-BASED SOUND OVER HEADPHONES">[EBU-Tech-3396]</a> can be used. The highest layout provided in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config②">scalable_channel_layout_config</a> can be used as the input to the renderer.</p>
    <h5 class="heading settled" data-level="7.3.2.4" id="processing-mixpresentation-rendering-a2b"><span class="secno">7.3.2.4. </span><span class="content">Rendering a Scene-Based Audio Element to Headphones (Informative)</span><a class="self-link" href="#processing-mixpresentation-rendering-a2b"></a></h5>
-   <p>Given a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑧">Audio Element</a> and headphones playback, the Resonance Audio renderer <a data-link-type="biblio" href="#biblio-resonance-audio" title="Efficient Encoding and Decoding of Binaural Sound with Resonance Audio">[Resonance-Audio]</a> can be used.</p>
+   <p>Given a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①①">Audio Element</a> and headphones playback, the Resonance Audio renderer <a data-link-type="biblio" href="#biblio-resonance-audio" title="Efficient Encoding and Decoding of Binaural Sound with Resonance Audio">[Resonance-Audio]</a> can be used.</p>
    <h4 class="heading settled" data-level="7.3.3" id="processing-mixpresentation-mixing"><span class="secno">7.3.3. </span><span class="content">Mixing Audio Elements</span><a class="self-link" href="#processing-mixpresentation-mixing"></a></h4>
-   <p>After rendering all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑨">Audio Element</a>s to a common playback layout, each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⓪">Audio Element</a> SHALL be processed individually before mixing as follows:</p>
+   <p>After rendering all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①②">Audio Element</a>s to a common playback layout, each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①③">Audio Element</a> SHALL be processed individually before mixing as follows:</p>
    <ol>
     <li data-md>
-     <p>If all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①①">Audio Element</a>s do not have a common sample rate, re-sample them to a common sample rate. This specification RECOMMENDs 48 kHz.</p>
+     <p>If all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①④">Audio Element</a>s do not have a common sample rate, re-sample them to a common sample rate. This specification RECOMMENDs 48 kHz.</p>
     <li data-md>
-     <p>If all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①②">Audio Element</a>s do not have a common bit-depth, convert them to a common bit-depth. This specification RECOMMENDs using 16 bits.</p>
+     <p>If all <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑤">Audio Element</a>s do not have a common bit-depth, convert them to a common bit-depth. This specification RECOMMENDs using 16 bits.</p>
     <li data-md>
-     <p>Apply the per-element gain using the gain value specified in <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config①">element_mix_config</a>.</p>
+     <p>Apply the per-element gain using the gain value specified in <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config">element_mix_config</a>.</p>
      <ul>
       <li data-md>
-       <p>If there are no element mix gain <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③①">Parameter Substream</a>s associated with the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①③">Audio Element</a>, use the <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain">default_mix_gain</a> value.</p>
+       <p>If there are no element mix gain <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③②">Parameter Substream</a>s associated with the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑥">Audio Element</a>, use the <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain">default_mix_gain</a> value.</p>
       <li data-md>
-       <p>Else, use the <a data-link-type="dfn" href="#param_data" id="ref-for-param_data">param_data</a> value provided in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data③">mix_gain_parameter_data</a>.</p>
+       <p>Else, use the <a data-link-type="dfn" href="#param_data" id="ref-for-param_data">param_data</a> value provided in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data①">mix_gain_parameter_data</a>.</p>
      </ul>
    </ol>
-   <p>The rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①④">Audio Element</a>s SHALL then be summed.</p>
-   <p>Finally, the output mix gain SHALL be applied using the value specified in <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config②">output_mix_config</a> to generate one sub-mixed audio signal.</p>
+   <p>The rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑦">Audio Element</a>s SHALL then be summed.</p>
+   <p>Finally, the output mix gain SHALL be applied using the value specified in <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config①">output_mix_config</a> to generate one sub-mixed audio signal.</p>
    <ul>
     <li data-md>
-     <p>If there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑦">Parameter Block OBU</a>s for the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③②">Parameter Substream</a>s associated with the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③②">Mix Presentation</a>, use the <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain①">default_mix_gain</a> value.</p>
+     <p>If there are no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑤">Parameter Block OBU</a>s for the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③③">Parameter Substream</a>s associated with the <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③④">Mix Presentation</a>, use the <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain①">default_mix_gain</a> value.</p>
     <li data-md>
-     <p>Else, use the <a data-link-type="dfn" href="#param_data" id="ref-for-param_data①">param_data</a> value provided in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data④">mix_gain_parameter_data</a>.</p>
+     <p>Else, use the <a data-link-type="dfn" href="#param_data" id="ref-for-param_data①">param_data</a> value provided in <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data②">mix_gain_parameter_data</a>.</p>
    </ul>
    <h3 class="heading settled" data-level="7.4" id="processing-animated-params"><span class="secno">7.4. </span><span class="content">Animated Parameters</span><a class="self-link" href="#processing-animated-params"></a></h3>
-   <p>This section describes how a set of parameter values is animated over a subblock in a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑧">Parameter Block OBU</a> and applied to the corresponding audio samples, using the information provided in AnimatedParameterData().</p>
+   <p>This section describes how a set of parameter values is animated over a subblock in a <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑥">Parameter Block OBU</a> and applied to the corresponding audio samples, using the information provided in <a data-link-type="dfn" href="#animatedparameterdata" id="ref-for-animatedparameterdata③">AnimatedParameterData()</a>.</p>
    <p>If <a data-link-type="dfn" href="#animation_type" id="ref-for-animation_type①">animation_type</a> is equal to STEP, the parameter value provided by <a data-link-type="dfn" href="#start_point_value" id="ref-for-start_point_value①">start_point_value</a> SHALL be applied to all time steps in the subblock.</p>
-   <p>If <a data-link-type="dfn" href="#animation_type" id="ref-for-animation_type②">animation_type</a> is equal to LINEAR or BEZIER, the information provided in AnimatedParameterData() combined with the timing information provided in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition①">ParamDefinition()</a> and the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑨">Parameter Block OBU</a> describe how the set of parameter values is animated as a Bezier curve. Let \(P_0\), \(P_1\), and \(P_2\) be 2D coordinates defined as</p>
+   <p>If <a data-link-type="dfn" href="#animation_type" id="ref-for-animation_type②">animation_type</a> is equal to LINEAR or BEZIER, the information provided in <a data-link-type="dfn" href="#animatedparameterdata" id="ref-for-animatedparameterdata④">AnimatedParameterData()</a> combined with the timing information provided in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition①">ParamDefinition()</a> and the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑦">Parameter Block OBU</a> describe how the set of parameter values is animated as a Bezier curve. Let \(P_0\), \(P_1\), and \(P_2\) be 2D coordinates defined as</p>
    <p>\[P_0 = (t_0, \text{start_point_value)},\]
 \[P_1 = (t_1, \text{control_point_value)},\]
 \[P_2 = (t_2, \text{end_point_value)},\]</p>
@@ -4605,7 +4626,7 @@ <h2 class="heading settled" data-level="8" id="iamfgeneration"><span class="secn
     <li data-md>
      <p>A list of channel layouts to be supported for scalable channel audio, which conforms to <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②③">loudspeaker_layout</a>.</p>
    </ul>
-   <p>The figure below shows an example architecture for an IA encoder that generates an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑧">IA Sequence</a> with one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑤">Audio Element</a>.</p>
+   <p>The figure below shows an example architecture for an IA encoder that generates an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑧">IA Sequence</a> with one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑧">Audio Element</a>.</p>
    <center><img height="632" src="images/IA Encoder Configuration.png" style="width:100%; height:auto;" width="1852"></center>
    <center>
     <figcaption>IA Encoder Configuration</figcaption>
@@ -4613,45 +4634,45 @@ <h2 class="heading settled" data-level="8" id="iamfgeneration"><span class="secn
    <p>The IA encoder is composed of the Pre-Processor, Codec Encoder, and OBU Packetizer modules.</p>
    <ul>
     <li data-md>
-     <p>The Pre-Processor outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑧">Channel Group</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">Descriptors</a> and optional <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③③">Parameter Substream</a>s based on the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑤">3D audio signal</a> and user inputs.</p>
+     <p>The Pre-Processor outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑨">Channel Group</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">Descriptors</a> and optional <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③④">Parameter Substream</a>s based on the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑤">3D audio signal</a> and user inputs.</p>
      <ul>
       <li data-md>
-       <p>It outputs one single <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑨">Channel Group</a> for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑥">Audio Element</a>.</p>
+       <p>It outputs one single <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⓪">Channel Group</a> for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑨">Audio Element</a>.</p>
       <li data-md>
-       <p>It outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⓪">Channel Group</a>s for a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑦">Audio Element</a>.</p>
+       <p>It outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤①">Channel Group</a>s for a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⓪">Audio Element</a>.</p>
       <li data-md>
-       <p>It outputs <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③④">Descriptors</a> which are composed of one <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑧">IA Sequence Header OBU</a>, one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑧">Codec Config OBU</a>, one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑨">Audio Element OBU</a>, and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑦">Mix Presentation OBU</a>s.</p>
+       <p>It outputs <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③④">Descriptors</a> which are composed of one <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①⓪">IA Sequence Header OBU</a>, one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⓪">Codec Config OBU</a>, one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②②">Audio Element OBU</a>, and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①②">Mix Presentation OBU</a>s.</p>
       <li data-md>
-       <p>It may output <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③④">Parameter Substream</a>s</p>
+       <p>It may output <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑤">Parameter Substream</a>s</p>
        <ul>
         <li data-md>
-         <p>For a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑧">Audio Element</a> with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②①">num_layers</a> = 1, it may output a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑤">Parameter Substream</a> with demixing info.</p>
+         <p>For a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②①">Audio Element</a> with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②①">num_layers</a> = 1, it may output a <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑥">Parameter Substream</a> with demixing info.</p>
         <li data-md>
-         <p>For a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑨">Audio Element</a> with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②②">num_layers</a> > 1, it outputs <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑥">Parameter Substream</a>s with demixing info and recon gain info.</p>
+         <p>For a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②②">Audio Element</a> with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②②">num_layers</a> > 1, it outputs <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑦">Parameter Substream</a>s with demixing info and recon gain info.</p>
         <li data-md>
-         <p>It may further output <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑦">Parameter Substream</a>s with mixing gain.</p>
+         <p>It may further output <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑧">Parameter Substream</a>s with mixing gain.</p>
        </ul>
      </ul>
     <li data-md>
-     <p>The Codec Encoder generates one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧②">Audio Substream</a>s from each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤①">Channel Group</a> based on the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑨">Codec Config OBU</a>.</p>
+     <p>The Codec Encoder generates one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑤">Audio Substream</a>s from each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤②">Channel Group</a> based on the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①①">Codec Config OBU</a>.</p>
     <li data-md>
-     <p>The OBU Packetizer packetizes <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑤">Descriptors</a>, <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑧">Parameter Substream</a>s and <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧③">Audio Substream</a>s into OBUs, and outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑨">IA Sequence</a>.</p>
+     <p>The OBU Packetizer packetizes <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑤">Descriptors</a>, <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑨">Parameter Substream</a>s and <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑥">Audio Substream</a>s into OBUs, and outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑨">IA Sequence</a>.</p>
      <ul>
       <li data-md>
-       <p>The Temporal Unit Generator generates a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑥">Temporal Unit</a> for each frame by grouping and ordering <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu③⑨">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⓪">Parameter Block OBU</a>s (if present).</p>
+       <p>The Temporal Unit Generator generates a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑦">Temporal Unit</a> for each frame by grouping and ordering <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④②">Audio Frame OBU</a>s and <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑧">Parameter Block OBU</a>s (if present).</p>
      </ul>
    </ul>
    <h3 class="heading settled" data-level="8.1" id="iamfgeneration-ambisonics"><span class="secno">8.1. </span><span class="content">Ambisonics Encoding</span><a class="self-link" href="#iamfgeneration-ambisonics"></a></h3>
    <p>For Ambisonics encoding:</p>
    <ul>
     <li data-md>
-     <p>The Pre-Processor outputs one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤②">Channel Group</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑥">Descriptors</a>. It is composed of only the Meta Generator.</p>
+     <p>The Pre-Processor outputs one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤③">Channel Group</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑥">Descriptors</a>. It is composed of only the Meta Generator.</p>
      <ul>
       <li data-md>
        <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑦">Descriptors</a> based on the Ambisonics mode and the number of channels.</p>
        <ul>
         <li data-md>
-         <p><a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode②">ambisonics_mode</a> is set as follows:</p>
+         <p><a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode④">ambisonics_mode</a> is set as follows:</p>
          <ul>
           <li data-md>
            <p>0 if <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something⑨②">ChannelMappingFamily</a> = 2, as specified in <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a>.</p>
@@ -4659,39 +4680,39 @@ <h3 class="heading settled" data-level="8.1" id="iamfgeneration-ambisonics"><spa
            <p>1 if <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8486#" id="ref-for-something⑨③">ChannelMappingFamily</a> = 3, as speciifed in <a data-link-type="biblio" href="#biblio-rfc-8486" title="Ambisonics in an Ogg Opus Container">[RFC-8486]</a>.</p>
          </ul>
         <li data-md>
-         <p><a data-link-type="dfn" href="#ambisonics_config" id="ref-for-ambisonics_config①">ambisonics_config</a> is set as follows:</p>
+         <p><a data-link-type="dfn" href="#ambisonics_config" id="ref-for-ambisonics_config">ambisonics_config</a> is set as follows:</p>
          <ul>
           <li data-md>
            <p><a data-link-type="dfn" href="#output_channel_count" id="ref-for-output_channel_count②">output_channel_count</a> is set to the number of Ambisonics channels, e.g., 4, 9, or 16.</p>
           <li data-md>
-           <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode③">ambisonics_mode</a> = 0, <a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping②">channel_mapping</a> is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧④">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤③">Channel Group</a>.</p>
+           <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode⑤">ambisonics_mode</a> = 0, <a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping②">channel_mapping</a> is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑦">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤④">Channel Group</a>.</p>
           <li data-md>
-           <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode④">ambisonics_mode</a> = 1, <a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix②">demixing_matrix</a> is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑤">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤④">Channel Group</a>.</p>
+           <p>If <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode⑥">ambisonics_mode</a> = 1, <a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix②">demixing_matrix</a> is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑧">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑤">Channel Group</a>.</p>
          </ul>
        </ul>
      </ul>
     <li data-md>
-     <p>The Codec Encoder outputs <a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count②">substream_count</a> number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑥">Audio Substream</a>s.</p>
+     <p>The Codec Encoder outputs <a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count②">substream_count</a> number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑨">Audio Substream</a>s.</p>
     <li data-md>
-     <p>The i-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑦">Temporal Unit</a> is composed of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⓪">Audio Frame OBU</a>s for the i-th frame.</p>
+     <p>The i-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑧">Temporal Unit</a> is composed of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④③">Audio Frame OBU</a>s for the i-th frame.</p>
      <ul>
       <li data-md>
-       <p>It may have an immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①②">Temporal Delimiter OBU</a>.</p>
+       <p>It may have an immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①④">Temporal Delimiter OBU</a>.</p>
      </ul>
    </ul>
    <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannelaudio"><span class="secno">8.2. </span><span class="content">Scalable Channel Audio Encoding</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio"></a></h3>
    <p>For Scalable Channel Audio encoding:</p>
    <ul>
     <li data-md>
-     <p>The Pre-Processor outputs N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑤">Channel Group</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②③">num_layers</a> = N), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑧">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑨">Parameter Substream</a>s. It is composed of a Down-Mix Parameter Generator, Down-Mixer, Loudness module, Channel Group Generator, Attenuation module, and Meta Generator.</p>
+     <p>The Pre-Processor outputs N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑥">Channel Group</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②③">num_layers</a> = N), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑧">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⓪">Parameter Substream</a>s. It is composed of a Down-Mix Parameter Generator, Down-Mixer, Loudness module, Channel Group Generator, Attenuation module, and Meta Generator.</p>
      <ul>
       <li data-md>
        <p>For non-scalable channel audio (i.e., <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②④">num_layers</a> = 1):</p>
        <ul>
         <li data-md>
-         <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⓪">Parameter Substream</a> for recon gain is not generated.</p>
+         <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④①">Parameter Substream</a> for recon gain is not generated.</p>
         <li data-md>
-         <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④①">Parameter Substream</a> for demixing info may be generated by implementers who assume it to be recommended for dynamic down-mixing on the decoder side.</p>
+         <p>A <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④②">Parameter Substream</a> for demixing info may be generated by implementers who assume it to be recommended for dynamic down-mixing on the decoder side.</p>
         <li data-md>
          <p>The Down-Mixer, Channel Group Generator, and Attenuation modules are not needed.</p>
        </ul>
@@ -4702,11 +4723,11 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
       <li data-md>
        <p>The Loudness module outputs the loudness level (<a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-4-201510-I!!PDF-E.pdf#" id="ref-for-something⑨④">LKFS</a>) of each <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑥">down-mixed audio</a> based on <a data-link-type="biblio" href="#biblio-itu-1770-4" title="Algorithms to measure audio programme loudness and true-peak audio level">[ITU-1770-4]</a>.</p>
       <li data-md>
-       <p>The Channel Group Generator transforms the input channel audio to N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑥">Channel Group</a>s for scalable channel audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑤">num_layers</a> = N by using the down-mix parameters and the list of channel layouts.</p>
+       <p>The Channel Group Generator transforms the input channel audio to N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑦">Channel Group</a>s for scalable channel audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑤">num_layers</a> = N by using the down-mix parameters and the list of channel layouts.</p>
       <li data-md>
-       <p>The Attenuation module applies a gain to the transformed <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑦">Channel Group</a>s to prevent clipping.</p>
+       <p>The Attenuation module applies a gain to the transformed <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑧">Channel Group</a>s to prevent clipping.</p>
       <li data-md>
-       <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑨">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④②">Parameter Substream</a>s.</p>
+       <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑨">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④③">Parameter Substream</a>s.</p>
        <ul>
         <li data-md>
          <p><a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⓪">Descriptors</a> are set as follows:</p>
@@ -4717,44 +4738,44 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
            <p><a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config④">channel_audio_layer_config</a> is set as follows:</p>
            <ul>
             <li data-md>
-             <p><a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②④">loudspeaker_layout</a> is set to the i-th list of channel layouts for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑧">Channel Group</a>.</p>
+             <p><a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②④">loudspeaker_layout</a> is set to the i-th list of channel layouts for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑨">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag③">output_gain_is_present_flag</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑨">Channel Group</a> if attenuation is applied to the mixed channels of the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⓪">Channel Group</a>. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥①">Channel Group</a>.</p>
+             <p><a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag③">output_gain_is_present_flag</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⓪">Channel Group</a> if attenuation is applied to the mixed channels of the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥①">Channel Group</a>. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥②">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag">recon_gain_is_present_flag</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥②">Channel Group</a> if the preceding <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥③">Channel Group</a>s has one or more mixed channels from the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑦">down-mixed audio</a> for the i-th channel layout. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥④">Channel Group</a>. When <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑦">num_layers</a> = 1, this flag is set to 0.</p>
+             <p><a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag">recon_gain_is_present_flag</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥③">Channel Group</a> if the preceding <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥④">Channel Group</a>s has one or more mixed channels from the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑦">down-mixed audio</a> for the i-th channel layout. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑤">Channel Group</a>. When <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑦">num_layers</a> = 1, this flag is set to 0.</p>
              <ul>
               <li data-md>
                <p>This flag is set to 0 for lossless codecs including LPCM.</p>
              </ul>
             <li data-md>
-             <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count③">substream_count</a> is set to the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑦">Audio Substream</a>s in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑤">Channel Group</a>.</p>
+             <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count③">substream_count</a> is set to the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨⓪">Audio Substream</a>s in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑥">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count①">coupled_substream_count</a> is set to the number of coupled substreams among the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑧">Audio Substream</a>s that make up the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑥">Channel Group</a>.</p>
+             <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count①">coupled_substream_count</a> is set to the number of coupled substreams among the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨①">Audio Substream</a>s that make up the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑦">Channel Group</a>.</p>
             <li data-md>
-             <p>Each bit in <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags③">output_gain_flags</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑦">Channel Group</a> if attenuation is applied to the relevant channel of the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑧">Channel Group</a>. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑨">Channel Group</a>.</p>
+             <p>Each bit in <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags③">output_gain_flags</a> is set to 1 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑧">Channel Group</a> if attenuation is applied to the relevant channel of the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑨">Channel Group</a>. Otherwise, it is set to 0 for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⓪">Channel Group</a>.</p>
             <li data-md>
              <p><a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑧">output_gain</a> is set to the gain (i.e., the inverse of the attenuation gain) which is applied to the channels indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags④">output_gain_flags</a>.</p>
            </ul>
          </ul>
         <li data-md>
-         <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④③">Parameter Substream</a>s can be composed of one for demixing info and the other for recon gain. When <a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag①">recon_gain_is_present_flag</a> = 0 for all <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⓪">Channel Group</a>s, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③①">Parameter Block OBU</a>s for recon gain info are present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⓪">IA Sequence</a>.</p>
+         <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④④">Parameter Substream</a>s can be composed of one for demixing info and the other for recon gain. When <a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag①">recon_gain_is_present_flag</a> = 0 for all <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦①">Channel Group</a>s, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑨">Parameter Block OBU</a>s for recon gain info are present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⓪">IA Sequence</a>.</p>
          <ul>
           <li data-md>
-           <p><a data-link-type="dfn" href="#dmixp_mode" id="ref-for-dmixp_mode">dmixp_mode</a> in <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data④">demixing_info_parameter_data</a> for the k-th frame is set to indicate (\(\alpha(k)\), \(\beta(k)\), \(\gamma(k)\), \(\delta(k)\)) and <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset①">w_idx_offset</a>(k), where <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset②">w_idx_offset</a>(k) = 1 or -1.</p>
+           <p><a data-link-type="dfn" href="#dmixp_mode" id="ref-for-dmixp_mode">dmixp_mode</a> in <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data⑤">demixing_info_parameter_data</a> for the k-th frame is set to indicate (\(\alpha(k)\), \(\beta(k)\), \(\gamma(k)\), \(\delta(k)\)) and <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset①">w_idx_offset</a>(k), where <a data-link-type="dfn" href="#w_idx_offset" id="ref-for-w_idx_offset②">w_idx_offset</a>(k) = 1 or -1.</p>
           <li data-md>
-           <p><a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags③">recon_gain_flags</a> in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑥">recon_gain_info_parameter_data</a> is set to indicate the de-mixed channels which need to apply <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑨">recon_gain</a> among the output channels after demixing for the i-th channel layout.</p>
+           <p><a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags③">recon_gain_flags</a> in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑤">recon_gain_info_parameter_data</a> is set to indicate the de-mixed channels which need to apply <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain⑨">recon_gain</a> among the output channels after demixing for the i-th channel layout.</p>
           <li data-md>
-           <p><a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain①⓪">recon_gain</a> is set to the gain value to be applied to the channel which is indicated by <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags④">recon_gain_flags</a> for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦①">Channel Group</a>.</p>
+           <p><a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain①⓪">recon_gain</a> is set to the gain value to be applied to the channel which is indicated by <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags④">recon_gain_flags</a> for the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦②">Channel Group</a>.</p>
          </ul>
        </ul>
      </ul>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑧">Temporal Unit</a> for the k-th frame is composed of zero or more <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③②">Parameter Block OBU</a>s, followed by the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④①">Audio Frame OBU</a>s for the k-th frame.</p>
+     <p>The <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑨">Temporal Unit</a> for the k-th frame is composed of zero or more <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⓪">Parameter Block OBU</a>s, followed by the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④④">Audio Frame OBU</a>s for the k-th frame.</p>
      <ul>
       <li data-md>
-       <p>It may have the immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①③">Temporal Delimiter OBU</a>.</p>
+       <p>It may have the immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⑤">Temporal Delimiter OBU</a>.</p>
       <li data-md>
-       <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦②">Channel Group</a>s in a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑨">Temporal Unit</a> are placed in order. In other words, the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦③">Channel Group</a> for the first channel layout comes first, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦④">Channel Group</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑤">Channel Group</a> for the third channel layout, and so on.</p>
+       <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦③">Channel Group</a>s in a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⓪">Temporal Unit</a> are placed in order. In other words, the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦④">Channel Group</a> for the first channel layout comes first, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑤">Channel Group</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑥">Channel Group</a> for the third channel layout, and so on.</p>
      </ul>
    </ul>
    <p>The figure below shows the IA encoding flowchart for Scalable Channel Audio.</p>
@@ -4769,72 +4790,72 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
      <p>The CG Generation module generates the transformed audio according to the CG generation rule based on the list of CLs and the down-mix parameters.</p>
      <ul>
       <li data-md>
-       <p>The transformed audio is structured as <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑥">Channel Group</a>s.</p>
+       <p>The transformed audio is structured as <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑦">Channel Group</a>s.</p>
      </ul>
     <li data-md>
      <p>Non-mixed channels of the transformed audio (i.e., the original channels of the input channel audio) are directly input to the Codec Encoder, but the mixed channels may be input first to the Attenuation module and then to the Codec Encoder.</p>
     <li data-md>
-     <p>The Attenuation module reduces all sample values of the mixed channels in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑦">Channel Group</a> at a uniform rate (<a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑨">output_gain</a>).</p>
+     <p>The Attenuation module reduces all sample values of the mixed channels in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑧">Channel Group</a> at a uniform rate (<a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑨">output_gain</a>).</p>
      <ul>
       <li data-md>
        <p>A range of 0 dB to -6 dB is recommended for attenuation. (i.e., a range of 0 dB to 6 dB for <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain①⓪">output_gain</a>)</p>
      </ul>
     <li data-md>
-     <p>The Codec Encoder generates the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑨">Audio Substream</a>s from the PCM samples, and then passes the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨⓪">Audio Substream</a>s and one single <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①③">decoder_config</a> to the OBU Packetizer.</p>
+     <p>The Codec Encoder generates the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨②">Audio Substream</a>s from the PCM samples, and then passes the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨③">Audio Substream</a>s and one single <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑥">decoder_config</a> to the OBU Packetizer.</p>
     <li data-md>
-     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④①">Descriptors</a> which consists of one <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑨">IA Sequence Header OBU</a>, one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⓪">Codec Config OBU</a>, one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⓪">Audio Element OBU</a> and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑧">Mix Presentation OBU</a>.</p>
+     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④①">Descriptors</a> which consists of one <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①①">IA Sequence Header OBU</a>, one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①②">Codec Config OBU</a>, one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②③">Audio Element OBU</a> and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①③">Mix Presentation OBU</a>.</p>
      <ul>
       <li data-md>
-       <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①①">Codec Config OBU</a> is generated based on <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①④">decoder_config</a>.</p>
+       <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①③">Codec Config OBU</a> is generated based on <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑦">decoder_config</a>.</p>
      </ul>
     <li data-md>
-     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③③">Parameter Block OBU</a>s for each frame which contains <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data⑤">demixing_info_parameter_data</a> and <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑦">recon_gain_info_parameter_data</a>.</p>
+     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④①">Parameter Block OBU</a>s for each frame which contains <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data⑥">demixing_info_parameter_data</a> and <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑥">recon_gain_info_parameter_data</a>.</p>
     <li data-md>
-     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④②">Audio Frame OBU</a>s for each frame of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨①">Audio Substream</a>s.</p>
+     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑤">Audio Frame OBU</a>s for each frame of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨④">Audio Substream</a>s.</p>
     <li data-md>
-     <p>The OBU Packetizer generates a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⓪">Temporal Unit</a> for each frame.</p>
+     <p>The OBU Packetizer generates a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②①">Temporal Unit</a> for each frame.</p>
      <ul>
       <li data-md>
-       <p>A <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②①">Temporal Unit</a> consists of zero or more <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③④">Parameter Block OBU</a>s, followed by <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④③">Audio Frame OBU</a>s.</p>
+       <p>A <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②②">Temporal Unit</a> consists of zero or more <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④②">Parameter Block OBU</a>s, followed by <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑥">Audio Frame OBU</a>s.</p>
        <ul>
         <li data-md>
-         <p>It may have the immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①④">Temporal Delimiter OBU</a>,</p>
+         <p>It may have the immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⑥">Temporal Delimiter OBU</a>,</p>
        </ul>
      </ul>
     <li data-md>
-     <p>The OBU Packetizer outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧①">IA Sequence</a> which is composed of OBUs for <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④②">Descriptors</a>, followed by OBUs for <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②②">Temporal Unit</a>s.</p>
+     <p>The OBU Packetizer outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧①">IA Sequence</a> which is composed of OBUs for <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④②">Descriptors</a>, followed by OBUs for <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②③">Temporal Unit</a>s.</p>
    </ul>
    <h3 class="heading settled" data-level="8.3" id="iamfgeneration-mixpresentation"><span class="secno">8.3. </span><span class="content">Mix Presentation Encoding</span><a class="self-link" href="#iamfgeneration-mixpresentation"></a></h3>
-   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑨">Mix Presentation OBU</a> for one single channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⓪">Audio Element</a> is set as follows:</p>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①④">Mix Presentation OBU</a> for one single channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②③">Audio Element</a> is set as follows:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes②">num_sub_mixes</a>: set to 1.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements②">num_audio_elements</a>: set to 1.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config②">element_mix_config</a>: No <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑤">Parameter Block OBU</a>s for <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config③">element_mix_config</a> and <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain②">default_mix_gain</a> = 0 dB.</p>
+     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config①">element_mix_config</a>: No <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④③">Parameter Block OBU</a>s for <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config②">element_mix_config</a> and <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain②">default_mix_gain</a> = 0 dB.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config③">output_mix_config</a>: No <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑥">Parameter Block OBU</a>s for <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config④">output_mix_config</a> and <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain③">default_mix_gain</a> = 0 dB.</p>
+     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config②">output_mix_config</a>: No <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④④">Parameter Block OBU</a>s for <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config③">output_mix_config</a> and <a data-link-type="dfn" href="#default_mix_gain" id="ref-for-default_mix_gain③">default_mix_gain</a> = 0 dB.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_layouts" id="ref-for-num_layouts①">num_layouts</a>: set to N, where N is the number of input channel layouts.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①④">loudness_layout</a>: set to L(1), L(2), ..., L(N), where L(i) is the measured layout for the i-th layer and i = 1, 2, ..., N.</p>
      <ul>
       <li data-md>
-       <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①">LoudnessInfo()</a> for L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo②">LoudnessInfo()</a> for L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo③">LoudnessInfo()</a> for L(N): loudness information of the audio rendered to to the measured layout L(i).</p>
+       <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo④">LoudnessInfo()</a> for L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑤">LoudnessInfo()</a> for L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑥">LoudnessInfo()</a> for L(N): loudness information of the audio rendered to to the measured layout L(i).</p>
      </ul>
    </ul>
    <p class="note" role="note"><span class="marker">NOTE:</span> If the input channel layouts do not include Stereo, then <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑧">num_layers</a> is set to N + 1 and the <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⑤">loudness_layout</a>s includes Stereo.</p>
-   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⓪">Mix Presentation OBU</a> for one single scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②①">Audio Element</a> is set as follows:</p>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑤">Mix Presentation OBU</a> for one single scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②④">Audio Element</a> is set as follows:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes③">num_sub_mixes</a>: set to 1</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements③">num_audio_elements</a>: set to 1</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config④">element_mix_config</a>: set to <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain">mix_gain</a></p>
+     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config③">element_mix_config</a>: set to <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain">mix_gain</a></p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config⑤">output_mix_config</a>: set to <a data-link-type="dfn" href="#output_mix_gain" id="ref-for-output_mix_gain">output_mix_gain</a></p>
+     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config④">output_mix_config</a>: set to <a data-link-type="dfn" href="#output_mix_gain" id="ref-for-output_mix_gain">output_mix_gain</a></p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_layouts" id="ref-for-num_layouts②">num_layouts</a>: set to M1, the number of layouts for which loudness information is provided.</p>
     <li data-md>
@@ -4844,20 +4865,20 @@ <h3 class="heading settled" data-level="8.3" id="iamfgeneration-mixpresentation"
        <p>One of them is Stereo.</p>
      </ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo④">LoudnessInfo()</a> on L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑤">LoudnessInfo()</a> on L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑥">LoudnessInfo()</a> on L(M1): loudness information of the audio rendered to the measured layout L(i).</p>
+     <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑦">LoudnessInfo()</a> on L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑧">LoudnessInfo()</a> on L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑨">LoudnessInfo()</a> on L(M1): loudness information of the audio rendered to the measured layout L(i).</p>
     <li data-md>
-     <p>This <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③③">Mix Presentation</a> is authored using the highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⑦">loudness_layout</a>.</p>
+     <p>This <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③⑤">Mix Presentation</a> is authored using the highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⑦">loudness_layout</a>.</p>
    </ul>
-   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①①">Mix Presentation OBU</a> for 2 <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②②">Audio Element</a>s is set as follows:</p>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑥">Mix Presentation OBU</a> for 2 <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑤">Audio Element</a>s is set as follows:</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_sub_mixes" id="ref-for-num_sub_mixes④">num_sub_mixes</a>: set to 1</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_audio_elements" id="ref-for-num_audio_elements④">num_audio_elements</a>: set to 2</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑤">element_mix_config</a> for each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②③">Audio Element</a>: set to <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain①">mix_gain</a></p>
+     <p><a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config④">element_mix_config</a> for each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑥">Audio Element</a>: set to <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain①">mix_gain</a></p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config⑥">output_mix_config</a>: set to <a data-link-type="dfn" href="#output_mix_gain" id="ref-for-output_mix_gain①">output_mix_gain</a></p>
+     <p><a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config⑤">output_mix_config</a>: set to <a data-link-type="dfn" href="#output_mix_gain" id="ref-for-output_mix_gain①">output_mix_gain</a></p>
     <li data-md>
      <p><a data-link-type="dfn" href="#num_layouts" id="ref-for-num_layouts③">num_layouts</a>: set to M2, the number of layouts for which loudness information is provided.</p>
     <li data-md>
@@ -4867,73 +4888,73 @@ <h3 class="heading settled" data-level="8.3" id="iamfgeneration-mixpresentation"
        <p>One of them is Stereo.</p>
      </ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑦">LoudnessInfo()</a> on L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑧">LoudnessInfo()</a> on L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo⑨">LoudnessInfo()</a> on L(M2): loudness information of the audio rendered to the measured layout L(i).</p>
+     <p><a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①⓪">LoudnessInfo()</a> on L(1), <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①①">LoudnessInfo()</a> on L(2), ..., <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①②">LoudnessInfo()</a> on L(M2): loudness information of the audio rendered to the measured layout L(i).</p>
     <li data-md>
-     <p>This <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③④">Mix Presentation</a> is authored using the highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⑨">loudness_layout</a>.</p>
+     <p>This <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③⑥">Mix Presentation</a> is authored using the highest <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout①⑨">loudness_layout</a>.</p>
    </ul>
    <h4 class="heading settled" data-level="8.3.1" id="iamfgeneration-mixpresentation-mix"><span class="secno">8.3.1. </span><span class="content">Element Mix Config</span><a class="self-link" href="#iamfgeneration-mixpresentation-mix"></a></h4>
-   <p>This section provides a guideline to generate <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑥">element_mix_config</a>.</p>
-   <p>An IA multiplexer may merge two <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧②">IA Sequence</a>s (or two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②④">Audio Element</a>s). In this case, it adjusts the gain values for <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑦">element_mix_config</a>s as necessary to describe the desired relative gains between the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧③">IA Sequence</a>s (or two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑤">Audio Element</a>s) when they are summed to generate the final mix. It also ensures that the gains selected do not result in clipping when the final mix is generated.</p>
+   <p>This section provides a guideline to generate <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑤">element_mix_config</a>.</p>
+   <p>An IA multiplexer may merge two <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧②">IA Sequence</a>s (or two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑦">Audio Element</a>s). In this case, it adjusts the gain values for <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑥">element_mix_config</a>s as necessary to describe the desired relative gains between the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧③">IA Sequence</a>s (or two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑧">Audio Element</a>s) when they are summed to generate the final mix. It also ensures that the gains selected do not result in clipping when the final mix is generated.</p>
    <h3 class="heading settled" data-level="8.4" id="iamfgeneration-multipleaudioelements"><span class="secno">8.4. </span><span class="content">Two Audio Elements Encoding</span><a class="self-link" href="#iamfgeneration-multipleaudioelements"></a></h3>
-   <p>This section provides a way to generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧④">IA Sequence</a> with two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑥">Audio Element</a>s from two <a href="#profiles-simple">Simple Profile</a> <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑤">IA Sequence</a>s.</p>
+   <p>This section provides a way to generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧④">IA Sequence</a> with two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑨">Audio Element</a>s from two <a href="#profiles-simple">Simple Profile</a> <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑤">IA Sequence</a>s.</p>
    <h4 class="heading settled" data-level="8.4.1" id="iamfgeneration-multipleaudioelements-onecodec"><span class="secno">8.4.1. </span><span class="content">Two Audio Elements with One Codec Config</span><a class="self-link" href="#iamfgeneration-multipleaudioelements-onecodec"></a></h4>
-   <p>This section provides a way to generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑥">IA Sequence</a> with two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑦">Audio Element</a>s from two <a href="#profiles-simple">Simple Profile</a> <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑦">IA Sequence</a>s with the same <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①②">Codec Config OBU</a>. The result complies with the <a href="#profiles-base">Base Profile</a>.</p>
+   <p>This section provides a way to generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑥">IA Sequence</a> with two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⓪">Audio Element</a>s from two <a href="#profiles-simple">Simple Profile</a> <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑦">IA Sequence</a>s with the same <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①④">Codec Config OBU</a>. The result complies with the <a href="#profiles-base">Base Profile</a>.</p>
    <p>Step 1: <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④③">Descriptors</a> are generated as follows:</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①⓪">IA Sequence Header OBU</a>: take the larger <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①⓪">primary_profile</a> field and the larger <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile⑥">additional_profile</a> field from the two input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑧">IA Sequence</a>s.</p>
+     <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①②">IA Sequence Header OBU</a>: take the larger <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①⓪">primary_profile</a> field and the larger <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile⑥">additional_profile</a> field from the two input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑧">IA Sequence</a>s.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①③">Codec Config OBU</a>: take the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①④">Codec Config OBU</a> from either of the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑨">IA Sequence</a>s.</p>
+     <p><a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑤">Codec Config OBU</a>: take the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑥">Codec Config OBU</a> from either of the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑨">IA Sequence</a>s.</p>
     <li data-md>
-     <p>Two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②①">Audio Element OBU</a>s: take both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②②">Audio Element OBU</a>s from both the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨⓪">IA Sequence</a>s and make the following modifications as needed:</p>
+     <p>Two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②④">Audio Element OBU</a>s: take both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑤">Audio Element OBU</a>s from both the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨⓪">IA Sequence</a>s and make the following modifications as needed:</p>
      <ul>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#audio_element_obu-codec_config_id" id="ref-for-audio_element_obu-codec_config_id①">codec_config_id</a>s in both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②③">Audio Element OBU</a> are updated to indicate the <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id①">codec_config_id</a> specified in the taken <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑤">Codec Config OBU</a>.</p>
+       <p>The <a data-link-type="dfn" href="#audio_element_obu-codec_config_id" id="ref-for-audio_element_obu-codec_config_id①">codec_config_id</a>s in both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑥">Audio Element OBU</a> are updated to indicate the <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id①">codec_config_id</a> specified in the taken <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑦">Codec Config OBU</a>.</p>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①">audio_element_id</a>s are updated to be unique between the two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②④">Audio Element OBU</a>s.</p>
+       <p>The <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①">audio_element_id</a>s are updated to be unique between the two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑦">Audio Element OBU</a>s.</p>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id②">audio_substream_id</a>s are updated to be unique between the two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑤">Audio Element OBU</a>s.</p>
+       <p>The <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id②">audio_substream_id</a>s are updated to be unique between the two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑧">Audio Element OBU</a>s.</p>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id③">parameter_id</a>s in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition②">ParamDefinition()</a>s carried in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑥">Audio Element OBU</a>s are updated to be unique within the new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨①">IA Sequence</a>.</p>
+       <p>The <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id③">parameter_id</a>s in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition②">ParamDefinition()</a>s carried in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑨">Audio Element OBU</a>s are updated to be unique within the new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨①">IA Sequence</a>.</p>
      </ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①②">Mix Presentation OBU</a>s: generate new ones which are used for mixing the two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑧">Audio Element</a>s.</p>
+     <p><a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑦">Mix Presentation OBU</a>s: generate new ones which are used for mixing the two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③①">Audio Element</a>s.</p>
      <ul>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id①">audio_element_id</a>s in each <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①③">Mix Presentation OBU</a> are set to indicate the <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id②">audio_element_id</a>s of the referred <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑦">Audio Element OBU</a>s.</p>
+       <p>The <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id①">audio_element_id</a>s in each <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑧">Mix Presentation OBU</a> are set to indicate the <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id②">audio_element_id</a>s of the referred <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③⓪">Audio Element OBU</a>s.</p>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id④">parameter_id</a>s in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition③">ParamDefinition()</a>s carried in each <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①④">Mix Presentation OBU</a> are set to refer to their associated <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④④">Parameter Substream</a>s.</p>
+       <p>The <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id④">parameter_id</a>s in <a data-link-type="dfn" href="#paramdefinition" id="ref-for-paramdefinition③">ParamDefinition()</a>s carried in each <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑨">Mix Presentation OBU</a> are set to refer to their associated <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⑤">Parameter Substream</a>s.</p>
      </ul>
    </ul>
-   <p>Step 2: The i-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②③">Temporal Unit</a> is generated as follows:</p>
+   <p>Step 2: The i-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②④">Temporal Unit</a> is generated as follows:</p>
    <ul>
     <li data-md>
-     <p>Place all <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑦">Parameter Block OBU</a>s for the i-th frame, followed by the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④④">Audio Frame OBU</a>s for the i-th frame (grouped by <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②⑨">Audio Element</a>s). Make the following modifications as needed:</p>
+     <p>Place all <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑤">Parameter Block OBU</a>s for the i-th frame, followed by the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑦">Audio Frame OBU</a>s for the i-th frame (grouped by <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③②">Audio Element</a>s). Make the following modifications as needed:</p>
      <ul>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑧">obu_type</a>s of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑤">Audio Frame OBU</a>s are updated to be aligned with the <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id③">audio_substream_id</a>s specified in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑧">Audio Element OBU</a>s.</p>
+       <p>The <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑧">obu_type</a>s of the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑧">Audio Frame OBU</a>s are updated to be aligned with the <a data-link-type="dfn" href="#audio_element_obu-audio_substream_id" id="ref-for-audio_element_obu-audio_substream_id③">audio_substream_id</a>s specified in the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③①">Audio Element OBU</a>s.</p>
       <li data-md>
-       <p>The <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⓪">parameter_id</a>s in the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑧">Parameter Block OBU</a>s are updated to identify their associated <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⑤">Parameter Substream</a>s based on the <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id⑤">parameter_id</a>s carried in the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④④">Descriptors</a>.</p>
+       <p>The <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①②">parameter_id</a>s in the <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑥">Parameter Block OBU</a>s are updated to identify their associated <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⑥">Parameter Substream</a>s based on the <a data-link-type="dfn" href="#paramdefinition-parameter_id" id="ref-for-paramdefinition-parameter_id⑤">parameter_id</a>s carried in the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④④">Descriptors</a>.</p>
      </ul>
     <li data-md>
-     <p>It may have an immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⑤">Temporal Delimiter OBU</a>.</p>
+     <p>It may have an immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①⑦">Temporal Delimiter OBU</a>.</p>
    </ul>
-   <p>Step 3: Generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨②">IA Sequence</a> which starts with <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⑤">Descriptors</a> and is followed by <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②④">Temporal Unit</a>s, in order.</p>
+   <p>Step 3: Generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨②">IA Sequence</a> which starts with <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⑤">Descriptors</a> and is followed by <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⑤">Temporal Unit</a>s, in order.</p>
    <h3 class="heading settled" data-level="8.5" id="iamfgeneration-postprocessing"><span class="secno">8.5. </span><span class="content">Post Processing</span><a class="self-link" href="#iamfgeneration-postprocessing"></a></h3>
    <p>This section provides a way to generate metadata for post-processing.</p>
    <h4 class="heading settled" data-level="8.5.1" id="iamfgeneration-postprocessing-loudness"><span class="secno">8.5.1. </span><span class="content">Loudness Information</span><a class="self-link" href="#iamfgeneration-postprocessing-loudness"></a></h4>
-   <p>This section provides a way to generate <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①⓪">LoudnessInfo()</a>, given a <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑤">Mix Presentation OBU</a> and a <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②⓪">loudness_layout</a>.</p>
+   <p>This section provides a way to generate <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①③">LoudnessInfo()</a>, given a <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②⓪">Mix Presentation OBU</a> and a <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②⓪">loudness_layout</a>.</p>
    <ol>
     <li data-md>
-     <p>Each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⓪">Audio Element</a> specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑥">Mix Presentation OBU</a> is rendered to the given <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②①">loudness_layout</a>.</p>
+     <p>Each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③③">Audio Element</a> specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②①">Mix Presentation OBU</a> is rendered to the given <a data-link-type="dfn" href="#loudness_layout" id="ref-for-loudness_layout②①">loudness_layout</a>.</p>
     <li data-md>
-     <p>Each rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③①">Audio Element</a> specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑦">Mix Presentation OBU</a> has a gain applied using the value from <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain②">mix_gain</a> specified in its <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑧">element_mix_config</a>.</p>
+     <p>Each rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③④">Audio Element</a> specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②②">Mix Presentation OBU</a> has a gain applied using the value from <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain②">mix_gain</a> specified in its <a data-link-type="dfn" href="#element_mix_config" id="ref-for-element_mix_config⑦">element_mix_config</a>.</p>
     <li data-md>
-     <p>All rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③②">Audio Element</a>s specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑧">Mix Presentation OBU</a> are summed.</p>
+     <p>All rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑤">Audio Element</a>s specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②③">Mix Presentation OBU</a> are summed.</p>
     <li data-md>
-     <p>The summed audio (i.e., <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑤">Rendered Mix Presentation</a>) has a gain applied using the value from <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain③">mix_gain</a> specified in <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config⑦">output_mix_config</a>.</p>
+     <p>The summed audio (i.e., <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑤">Rendered Mix Presentation</a>) has a gain applied using the value from <a data-link-type="dfn" href="#mix_gain" id="ref-for-mix_gain③">mix_gain</a> specified in <a data-link-type="dfn" href="#output_mix_config" id="ref-for-output_mix_config⑥">output_mix_config</a>.</p>
     <li data-md>
-     <p>Generate <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①①">LoudnessInfo()</a> for the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑥">Rendered Mix Presentation</a> according to <a href="#obu-mixpresentation-loudness">§ 3.7.7 Loudness Info Syntax and Semantics</a>.</p>
+     <p>Generate <a data-link-type="dfn" href="#loudnessinfo" id="ref-for-loudnessinfo①④">LoudnessInfo()</a> for the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑥">Rendered Mix Presentation</a> according to <a href="#obu-mixpresentation-loudness">§ 3.7.7 Loudness Info Syntax and Semantics</a>.</p>
    </ol>
    <h2 class="heading settled" data-level="9" id="convention"><span class="secno">9. </span><span class="content">Convention</span><a class="self-link" href="#convention"></a></h2>
    <h3 class="heading settled" data-level="9.1" id="convention-syntaxstructure"><span class="secno">9.1. </span><span class="content">Syntax Description</span><a class="self-link" href="#convention-syntaxstructure"></a></h3>
@@ -4985,7 +5006,7 @@ <h3 class="heading settled" data-level="9.3" id="convention-qformat"><span class
    <p><b>Qx.y</b> indicates that it is stored as a (x+y+1)-bit, signed, two’s complement fixed-point value with y fractional bits. That is, a (x+y+1)-bit signed (two’s complement) integer, that is implicitly multiplied by the scaling factor 2^(−y).</p>
    <h2 class="heading settled" data-level="10" id="annex"><span class="secno">10. </span><span class="content">Annex</span><a class="self-link" href="#annex"></a></h2>
    <h3 class="heading settled" data-level="10.1" id="Annex_A"><span class="secno">10.1. </span><span class="content">Annex A: ID Linking Scheme (Informative)</span><a class="self-link" href="#Annex_A"></a></h3>
-   <p>The figure below shows the linking scheme among IDs in the obu_header or OBU payload.</p>
+   <p>The figure below shows the linking scheme among IDs in the <a data-link-type="dfn" href="#obu-header" id="ref-for-obu-header⑦">OBU Header</a> or OBU payload.</p>
    <center><img height="1048" src="images/ID Linking Example.png" style="width:100%; height:auto;" width="1783"></center>
    <center>
     <figcaption>ID Linking Scheme</figcaption>
@@ -4993,53 +5014,53 @@ <h3 class="heading settled" data-level="10.1" id="Annex_A"><span class="secno">1
    <p>In the figure above,</p>
    <ul>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑥">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id②">codec_config_id</a> = 0 is providing its <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id②②">codec_id</a> and <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①⑤">decoder_config</a>.</p>
+     <p>The <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑧">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id②">codec_config_id</a> = 0 is providing its <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id②②">codec_id</a> and <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config⑧">decoder_config</a>.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑨">Mix Presentation OBU</a> with <a data-link-type="dfn" href="#mix_presentation_id" id="ref-for-mix_presentation_id①">mix_presentation_id</a> = 21 is saying:</p>
+     <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②④">Mix Presentation OBU</a> with <a data-link-type="dfn" href="#mix_presentation_id" id="ref-for-mix_presentation_id①">mix_presentation_id</a> = 21 is saying:</p>
      <ul>
       <li data-md>
-       <p>There are two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③③">Audio Element</a>s (with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id③">audio_element_id</a> = 11 and 12) which need to be mixed. The <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id②">audio_element_id</a> = 11 and the <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id③">audio_element_id</a> = 12 are linked to the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑨">Audio Element OBU</a>s with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id④">audio_element_id</a> = 11 and <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑤">audio_element_id</a> = 12, respectively.</p>
+       <p>There are two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑥">Audio Element</a>s (with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id③">audio_element_id</a> = 11 and 12) which need to be mixed. The <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id②">audio_element_id</a> = 11 and the <a data-link-type="dfn" href="#mix_presentation_obu-audio_element_id" id="ref-for-mix_presentation_obu-audio_element_id③">audio_element_id</a> = 12 are linked to the <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③②">Audio Element OBU</a>s with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id④">audio_element_id</a> = 11 and <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑤">audio_element_id</a> = 12, respectively.</p>
        <ul>
         <li data-md>
-         <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu③⑨">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①①">parameter_id</a> = 32 to be used for mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③④">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑥">audio_element_id</a> = 11.</p>
+         <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑦">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①③">parameter_id</a> = 32 to be used for mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑦">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑥">audio_element_id</a> = 11.</p>
         <li data-md>
-         <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⓪">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①②">parameter_id</a> = 33 to be used for mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑤">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑦">audio_element_id</a> = 12.</p>
+         <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑧">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①④">parameter_id</a> = 33 to be used for mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑧">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑦">audio_element_id</a> = 12.</p>
        </ul>
       <li data-md>
-       <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④①">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①③">parameter_id</a> = 34 to be used for mixing the two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑥">Audio Element</a>s.</p>
+       <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑨">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑤">parameter_id</a> = 34 to be used for mixing the two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑨">Audio Element</a>s.</p>
      </ul>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③⓪">Audio Element OBU</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑧">audio_element_id</a> = 11 is saying:</p>
+     <p>The <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③③">Audio Element OBU</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑧">audio_element_id</a> = 11 is saying:</p>
      <ul>
       <li data-md>
-       <p>This <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑦">Audio Element</a> has been coded using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑦">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id③">codec_config_id</a> = 0.</p>
+       <p>This <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⓪">Audio Element</a> has been coded using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑨">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id③">codec_config_id</a> = 0.</p>
       <li data-md>
-       <p>There are two <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨②">Audio Substream</a>s (<a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑧">audio_substream_id</a> = 0 and 1, respectively) in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑧">Audio Element</a>. They are linked to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑥">Audio Frame OBU</a>s with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑨">audio_substream_id</a> = 0 and <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①⓪">audio_substream_id</a> = 1 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑨">obu_type</a> = OBU_IA_Audio_Frame_ID0 and <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①⓪">obu_type</a> = OBU_IA_Audio_Frame_ID1), respectively.</p>
+       <p>There are two <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨⑤">Audio Substream</a>s (<a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑧">audio_substream_id</a> = 0 and 1, respectively) in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④①">Audio Element</a>. They are linked to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑨">Audio Frame OBU</a>s with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id⑨">audio_substream_id</a> = 0 and <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①⓪">audio_substream_id</a> = 1 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑨">obu_type</a> = OBU_IA_Audio_Frame_ID0 and <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①⓪">obu_type</a> = OBU_IA_Audio_Frame_ID1), respectively.</p>
       <li data-md>
-       <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④②">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①④">parameter_id</a> = 31 to be used for demixing this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③⑨">Audio Element</a>.</p>
+       <p>There are <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤⓪">Parameter Block OBU</a>s with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑥">parameter_id</a> = 31 to be used for demixing this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④②">Audio Element</a>.</p>
      </ul>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③①">Audio Element OBU</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑨">audio_element_id</a> = 12 is saying:</p>
+     <p>The <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu③④">Audio Element OBU</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id⑨">audio_element_id</a> = 12 is saying:</p>
      <ul>
       <li data-md>
-       <p>This <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⓪">Audio Element</a> has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑧">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id④">codec_config_id</a> = 0.</p>
+       <p>This <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④③">Audio Element</a> has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②⓪">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id④">codec_config_id</a> = 0.</p>
       <li data-md>
-       <p>There is one <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨③">Audio Substream</a> (<a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①①">audio_substream_id</a> = 2) in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④①">Audio Element</a>. It is linked to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑦">Audio Frame OBU</a>s with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①②">audio_substream_id</a> = 2 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①①">obu_type</a> = OBU_IA_Audio_Frame_ID2).</p>
+       <p>There is one <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨⑥">Audio Substream</a> (<a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①①">audio_substream_id</a> = 2) in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④④">Audio Element</a>. It is linked to the <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤⓪">Audio Frame OBU</a>s with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①②">audio_substream_id</a> = 2 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①①">obu_type</a> = OBU_IA_Audio_Frame_ID2).</p>
      </ul>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑧">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①③">audio_substream_id</a> = 0 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①②">obu_type</a> = OBU_IA_Audio_Frame_ID0) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu①⑨">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑤">codec_config_id</a> = 0.</p>
+     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤①">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①③">audio_substream_id</a> = 0 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①②">obu_type</a> = OBU_IA_Audio_Frame_ID0) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②①">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑤">codec_config_id</a> = 0.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu④⑨">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①④">audio_substream_id</a> = 1 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①③">obu_type</a> = OBU_IA_Audio_Frame_ID1) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②⓪">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑥">codec_config_id</a> = 0.</p>
+     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤②">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①④">audio_substream_id</a> = 1 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①③">obu_type</a> = OBU_IA_Audio_Frame_ID1) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②②">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑥">codec_config_id</a> = 0.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤⓪">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①⑤">audio_substream_id</a> = 2 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①④">obu_type</a> = OBU_IA_Audio_Frame_ID2) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②①">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑦">codec_config_id</a> = 0.</p>
+     <p>The <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu⑤③">Audio Frame OBU</a> with <a data-link-type="dfn" href="#audio_substream-audio_substream_id" id="ref-for-audio_substream-audio_substream_id①⑤">audio_substream_id</a> = 2 (i.e., <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type①④">obu_type</a> = OBU_IA_Audio_Frame_ID2) is providing the coded data which has been coded by using the <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu②③">Codec Config OBU</a> with <a data-link-type="dfn" href="#codec_config_obu-codec_config_id" id="ref-for-codec_config_obu-codec_config_id⑦">codec_config_id</a> = 0.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④③">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑤">parameter_id</a> = 31 is providing <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data⑥">demixing_info_parameter_data</a> to be applied for demixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④②">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①⓪">audio_element_id</a> = 11.</p>
+     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤①">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑦">parameter_id</a> = 31 is providing <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data⑦">demixing_info_parameter_data</a> to be applied for demixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑤">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①⓪">audio_element_id</a> = 11.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④④">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑥">parameter_id</a> = 32 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data⑤">mix_gain_parameter_data</a> to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④③">Audio Element</a> after rendering according to <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config①">rendering_config</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④④">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①①">audio_element_id</a> = 11.</p>
+     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤②">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑧">parameter_id</a> = 32 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data③">mix_gain_parameter_data</a> to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑥">Audio Element</a> after rendering according to <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config①">rendering_config</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑦">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①①">audio_element_id</a> = 11.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑤">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑦">parameter_id</a> = 33 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data⑥">mix_gain_parameter_data</a> to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑤">Audio Element</a> after rendering according to <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config②">rendering_config</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑥">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①②">audio_element_id</a> = 12.</p>
+     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤③">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑨">parameter_id</a> = 33 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data④">mix_gain_parameter_data</a> to be applied to the rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑧">Audio Element</a> after rendering according to <a data-link-type="dfn" href="#rendering_config" id="ref-for-rendering_config②">rendering_config</a> of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑨">Audio Element</a> with <a data-link-type="dfn" href="#audio_element_obu-audio_element_id" id="ref-for-audio_element_obu-audio_element_id①②">audio_element_id</a> = 12.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu④⑥">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id①⑧">parameter_id</a> = 34 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data⑦">mix_gain_parameter_data</a> to be applied to the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑦">Rendered Mix Presentation</a> of the two rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④⑦">Audio Element</a>s.</p>
+     <p>The <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu⑤④">Parameter Block OBU</a> with <a data-link-type="dfn" href="#parameter_block_obu-parameter_id" id="ref-for-parameter_block_obu-parameter_id②⓪">parameter_id</a> = 34 is providing <a data-link-type="dfn" href="#mix_gain_parameter_data" id="ref-for-mix_gain_parameter_data⑤">mix_gain_parameter_data</a> to be applied to the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation⑦">Rendered Mix Presentation</a> of the two rendered <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⑤⓪">Audio Element</a>s.</p>
    </ul>
    <h3 class="heading settled" data-level="10.2" id="Annex_B"><span class="secno">10.2. </span><span class="content">Annex B: Rules for Scalable Channel Audio</span><a class="self-link" href="#Annex_B"></a></h3>
    <p>This Annex specifies normative rules for scalable channel audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑨">num_layers</a> > 1.</p>
@@ -5164,49 +5185,49 @@ <h4 class="heading settled" data-level="10.2.4" id="iamfgeneration-scalablechann
    <p>For example, if we assume that CL #i = 7.1.4ch and CL #i-1 = 5.1.2ch, then the de-mixed channels are D_Lrs7, D_Rrs7, D_Ltb4 and D_Rtb4.</p>
    <ul>
     <li data-md>
-     <p>D_Lrs7 and D_Rrs7 are de-mixed from Ls5 and Rs5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑧">Channel Group</a> by using Lss7 and Rss7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑨">Channel Group</a> and its relevant demixing parameters (i.e., \(\alpha(k)\) and \(\beta(k)\)) , respectively.</p>
+     <p>D_Lrs7 and D_Rrs7 are de-mixed from Ls5 and Rs5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑨">Channel Group</a> by using Lss7 and Rss7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⓪">Channel Group</a> and its relevant demixing parameters (i.e., \(\alpha(k)\) and \(\beta(k)\)) , respectively.</p>
     <li data-md>
-     <p>D_Ltb4 and D_Rtb4 are de-mixed from Ltf2 and Rtf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⓪">Channel Group</a> by using Ltf4 and Rtf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧①">Channel Group</a> and its relevant demixing parameter (i.e., \(\gamma(k)\)), respectively.</p>
+     <p>D_Ltb4 and D_Rtb4 are de-mixed from Ltf2 and Rtf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧①">Channel Group</a> by using Ltf4 and Rtf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧②">Channel Group</a> and its relevant demixing parameter (i.e., \(\gamma(k)\)), respectively.</p>
    </ul>
    <p>Recon_Gain for D_Lrs7:</p>
    <ul>
     <li data-md>
-     <p>\(O_k\) is the signal power for frame \(k\) of Lrs7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧②">Channel Group</a>.</p>
+     <p>\(O_k\) is the signal power for frame \(k\) of Lrs7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧③">Channel Group</a>.</p>
     <li data-md>
-     <p>\(M_k\) is the signal power for frame \(k\) of Ls5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧③">Channel Group</a>.</p>
+     <p>\(M_k\) is the signal power for frame \(k\) of Ls5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧④">Channel Group</a>.</p>
     <li data-md>
      <p>\(D_k\) is the signal power for frame \(k\) of D_Lrs7.</p>
    </ul>
    <p>Recon_Gain for D_Rrs7:</p>
    <ul>
     <li data-md>
-     <p>\(O_k\) is the signal power for frame \(k\) of Rrs7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧④">Channel Group</a>.</p>
+     <p>\(O_k\) is the signal power for frame \(k\) of Rrs7 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑤">Channel Group</a>.</p>
     <li data-md>
-     <p>\(M_k\) is the signal power for frame \(k\) of Rs5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑤">Channel Group</a>.</p>
+     <p>\(M_k\) is the signal power for frame \(k\) of Rs5 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑥">Channel Group</a>.</p>
     <li data-md>
      <p>\(D_k\) is the signal power for frame \(k\) of D_Rrs7.</p>
    </ul>
    <p>Recon_Gain for D_Ltb4:</p>
    <ul>
     <li data-md>
-     <p>\(O_k\) is the signal power for frame \(k\) of Ltf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑥">Channel Group</a>.</p>
+     <p>\(O_k\) is the signal power for frame \(k\) of Ltf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑦">Channel Group</a>.</p>
     <li data-md>
-     <p>\(M_k\) is the signal power for frame \(k\) of Ltf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑦">Channel Group</a>.</p>
+     <p>\(M_k\) is the signal power for frame \(k\) of Ltf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑧">Channel Group</a>.</p>
     <li data-md>
      <p>\(D_k\) is the signal power for frame \(k\) of D_Ltb4.</p>
    </ul>
    <p>Recon_Gain for D_Rtb4:</p>
    <ul>
     <li data-md>
-     <p>\(O_k\) is the signal power for frame \(k\) of Rtf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑧">Channel Group</a>.</p>
+     <p>\(O_k\) is the signal power for frame \(k\) of Rtf4 in the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑨">Channel Group</a>.</p>
     <li data-md>
-     <p>\(M_k\) is the signal power for frame \(k\) of Rtf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑨">Channel Group</a>.</p>
+     <p>\(M_k\) is the signal power for frame \(k\) of Rtf2 in the (i-1)-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⓪">Channel Group</a>.</p>
     <li data-md>
      <p>\(D_k\) is the signal power for frame \(k\) of D_Rtb4.</p>
    </ul>
    <h4 class="heading settled" data-level="10.2.5" id="iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"><span class="secno">10.2.5. </span><span class="content">Annex B-5: Channel Group Generation Rule (Informative)</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"></a></h4>
-   <p>This section describes the generation rule for a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⓪">Channel Group</a> (CG).</p>
-   <p>For a given channel-based input audio and the list of CLs ({CL #i: i = 1, 2, ..., n}), the CG Generation module outputs the transformed audio (i.e., <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨①">Channel Group</a>s) which adheres to <a href="#iamfgeneration-scalablechannelaudio-channelgroupformat">§ 10.2.6 Annex B-6: Channel Group Format (Normative)</a>.</p>
+   <p>This section describes the generation rule for a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨①">Channel Group</a> (CG).</p>
+   <p>For a given channel-based input audio and the list of CLs ({CL #i: i = 1, 2, ..., n}), the CG Generation module outputs the transformed audio (i.e., <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨②">Channel Group</a>s) which adheres to <a href="#iamfgeneration-scalablechannelaudio-channelgroupformat">§ 10.2.6 Annex B-6: Channel Group Format (Normative)</a>.</p>
    <p>An example of a transformation matrix with 4 CGs (2ch/3.1.2ch/5.1.2ch/7.1.4ch) is given below,</p>
    <p>\[
 	\begin{array}{c}
@@ -5303,14 +5324,14 @@ <h4 class="heading settled" data-level="10.2.5" id="iamfgeneration-scalablechann
 \[c(k) = w(k) \times \delta(k) \times \alpha(k),\]
 \[d(k) = w(k) \times \delta(k) \times \beta(k).\]</p>
    <h4 class="heading settled" data-level="10.2.6" id="iamfgeneration-scalablechannelaudio-channelgroupformat"><span class="secno">10.2.6. </span><span class="content">Annex B-6: Channel Group Format (Normative)</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio-channelgroupformat"></a></h4>
-   <p>The <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨②">Channel Group</a> format SHALL conform to the following rules:</p>
+   <p>The <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨③">Channel Group</a> format SHALL conform to the following rules:</p>
    <ul>
     <li data-md>
-     <p>It consists of C number of channels and is structured to n number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨③">Channel Group</a>s, where C is the number of channels for the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑤">3D audio signal</a>.</p>
+     <p>It consists of C number of channels and is structured to n number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨④">Channel Group</a>s, where C is the number of channels for the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑤">3D audio signal</a>.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨④">Channel Group</a> #1 (as called BCG): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑤">Channel Group</a> is the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑥">down-mixed audio</a> itself for CL #1 generated from the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑥">3D audio signal</a>. It contains a C1 number of channels.</p>
+     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑤">Channel Group</a> #1 (as called BCG): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑥">Channel Group</a> is the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑥">down-mixed audio</a> itself for CL #1 generated from the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑥">3D audio signal</a>. It contains a C1 number of channels.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑥">Channel Group</a> #i (as called DCG, i = 2, 3, …, n): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑦">Channel Group</a> contains (Ci – Ci-1) number of channels. (Ci – Ci-1) channel(s) consists of as follows:</p>
+     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑦">Channel Group</a> #i (as called DCG, i = 2, 3, …, n): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑧">Channel Group</a> contains (Ci – Ci-1) number of channels. (Ci – Ci-1) channel(s) consists of as follows:</p>
      <ul>
       <li data-md>
        <p>(Xi – Xi-1) surround channel(s) if Xi > Xi-1 . When \(S_{\text{set}} = \{x  \mid \text{Xi}-1 &lt; x \le \text{Xi}\} \) and \(x\) is an integer,</p>
@@ -5330,9 +5351,9 @@ <h4 class="heading settled" data-level="10.2.6" id="iamfgeneration-scalablechann
        <p>(Zi - Zi-1) top channels if Zi > Zi-1.</p>
        <ul>
         <li data-md>
-         <p>If Zi-1 = 0, the top channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑦">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑧">Channel Group</a> #i.</p>
+         <p>If Zi-1 = 0, the top channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑦">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑨">Channel Group</a> #i.</p>
         <li data-md>
-         <p>If Zi-1 = 2, the Ltf and Rtf channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑧">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑨">Channel Group</a> #i.</p>
+         <p>If Zi-1 = 2, the Ltf and Rtf channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑧">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⓪⓪">Channel Group</a> #i.</p>
        </ul>
       <li data-md>
        <p>Where Xi.Yi.Zi denotes the channel layout in CL #i, where Xi is the number of surround channels, Yi is the number of LFE channels and Zi is the number of height channels.</p>
@@ -5508,9 +5529,11 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#71ch">7.1ch</a><span>, in § 3.6.2</span>
    <li><a href="#additional_profile">additional_profile</a><span>, in § 3.4</span>
    <li><a href="#ambisonics_config">ambisonics_config</a><span>, in § 3.6</span>
+   <li><a href="#ambisonicsconfig">AmbisonicsConfig()</a><span>, in § 3.6.3</span>
    <li><a href="#ambisonics_mode">ambisonics_mode</a><span>, in § 3.6.3</span>
    <li><a href="#anchored_loudness">anchored_loudness</a><span>, in § 3.7.7</span>
    <li><a href="#anchor_element">anchor_element</a><span>, in § 3.7.7</span>
+   <li><a href="#animatedparameterdata">AnimatedParameterData()</a><span>, in § 3.8.1</span>
    <li><a href="#animation_type">animation_type</a><span>, in § 3.8.1</span>
    <li><a href="#audio-element">Audio Element</a><span>, in § 2.1</span>
    <li><a href="#audio_element_config_bytes">audio_element_config_bytes</a><span>, in § 3.6</span>
@@ -5522,10 +5545,10 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#audio_element_obu-audio_element_id">dfn for audio_element_obu</a><span>, in § 3.6</span>
      <li><a href="#mix_presentation_obu-audio_element_id">dfn for mix_presentation_obu</a><span>, in § 3.7</span>
     </ul>
-   <li><a href="#audio-element-obu">Audio Element OBU</a><span>, in § 2.3.2.1</span>
+   <li><a href="#audio-element-obu">Audio Element OBU</a><span>, in § 3.6</span>
    <li><a href="#audio_element_type">audio_element_type</a><span>, in § 3.6</span>
-   <li><a href="#audio_frame">audio_frame()</a><span>, in § 3.9</span>
-   <li><a href="#audio-frame-obu">Audio Frame OBU</a><span>, in § 2.3.2.2</span>
+   <li><a href="#audio_frame">audio_frame</a><span>, in § 3.9</span>
+   <li><a href="#audio-frame-obu">Audio Frame OBU</a><span>, in § 3.9</span>
    <li><a href="#audio_roll_distance">audio_roll_distance</a><span>, in § 3.5</span>
    <li><a href="#audio-substream">Audio Substream</a><span>, in § 2.1</span>
    <li>
@@ -5535,15 +5558,18 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#audio_substream-audio_substream_id">dfn for audio_substream</a><span>, in § 3.9</span>
     </ul>
    <li><a href="#channel_audio_layer_config">channel_audio_layer_config</a><span>, in § 3.6.2</span>
+   <li><a href="#channelaudiolayerconfig">ChannelAudioLayerConfig()</a><span>, in § 3.6.2</span>
    <li><a href="#channel-group">Channel Group</a><span>, in § 2.1</span>
    <li><a href="#channel_mapping">channel_mapping</a><span>, in § 3.6.3</span>
+   <li><a href="#codec_config">codec_config</a><span>, in § 3.5</span>
+   <li><a href="#codecconfig">CodecConfig()</a><span>, in § 3.5</span>
    <li>
     codec_config_id
     <ul>
      <li><a href="#audio_element_obu-codec_config_id">dfn for audio_element_obu</a><span>, in § 3.6</span>
      <li><a href="#codec_config_obu-codec_config_id">dfn for codec_config_obu</a><span>, in § 3.5</span>
     </ul>
-   <li><a href="#codec-config-obu">Codec Config OBU</a><span>, in § 2.3.2.1</span>
+   <li><a href="#codec-config-obu">Codec Config OBU</a><span>, in § 3.5</span>
    <li><a href="#codec_id">codec_id</a><span>, in § 3.5</span>
    <li><a href="#coded_frame_size">coded_frame_size</a><span>, in § 3.9</span>
    <li><a href="#configobus">configOBUs</a><span>, in § 6.2.3</span>
@@ -5559,12 +5585,16 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#coupled-stereo-channels">Coupled stereo channels</a><span>, in § 3.6.2</span>
    <li><a href="#coupled_substream_count">coupled_substream_count</a><span>, in § 3.6.2</span>
    <li><a href="#decoder_config">decoder_config</a><span>, in § 3.5</span>
+   <li><a href="#decoderconfig">DecoderConfig()</a><span>, in § 3.11</span>
    <li><a href="#default_demixing_info_parameter_data">default_demixing_info_parameter_data</a><span>, in § 3.6</span>
+   <li><a href="#defaultdemixinginfoparameterdata">DefaultDemixingInfoParameterData()</a><span>, in § 3.6</span>
    <li><a href="#default_mix_gain">default_mix_gain</a><span>, in § 3.7.4</span>
    <li><a href="#default_w">default_w</a><span>, in § 3.6</span>
    <li><a href="#demixing_info">demixing_info</a><span>, in § 3.6</span>
-   <li><a href="#demixing_info_parameter_data">demixing_info_parameter_data</a><span>, in § 3.8.2</span>
+   <li><a href="#demixing_info_parameter_data">demixing_info_parameter_data</a><span>, in § 3.8</span>
+   <li><a href="#demixinginfoparameterdata">DemixingInfoParameterData()</a><span>, in § 3.8.2</span>
    <li><a href="#demixing_matrix">demixing_matrix</a><span>, in § 3.6.3</span>
+   <li><a href="#demixingparamdefinition">DemixingParamDefinition()</a><span>, in § 3.6</span>
    <li><a href="#descriptors">Descriptors</a><span>, in § 2.3.2.1</span>
    <li><a href="#digital_peak">digital_peak</a><span>, in § 3.7.7</span>
    <li><a href="#dmixp_mode">dmixp_mode</a><span>, in § 3.8.2</span>
@@ -5576,6 +5606,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#parameter_block_obu-duration">dfn for parameter_block_obu</a><span>, in § 3.8</span>
     </ul>
    <li><a href="#element_mix_config">element_mix_config</a><span>, in § 3.7</span>
+   <li><a href="#elementmixconfig">ElementMixConfig()</a><span>, in § 3.7.4</span>
    <li><a href="#end_point_value">end_point_value</a><span>, in § 3.8.1</span>
    <li><a href="#explicit_audio_substream_id">explicit_audio_substream_id</a><span>, in § 3.9</span>
    <li><a href="#extension_header_bytes">extension_header_bytes</a><span>, in § 3.2</span>
@@ -5594,7 +5625,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#ia-sample">IA Sample</a><span>, in § 6.2.4</span>
    <li><a href="#iasampleentry">IASampleEntry</a><span>, in § 6.2.3</span>
    <li><a href="#ia-sequence">IA Sequence</a><span>, in § 5.1</span>
-   <li><a href="#ia-sequence-header-obu">IA Sequence Header OBU</a><span>, in § 2.3.2.1</span>
+   <li><a href="#ia-sequence-header-obu">IA Sequence Header OBU</a><span>, in § 3.4</span>
    <li><a href="#ia-track">IA Track</a><span>, in § 6.2.1</span>
    <li><a href="#immersive-audio">Immersive Audio</a><span>, in § 2.1</span>
    <li><a href="#info_type">info_type</a><span>, in § 3.7.7</span>
@@ -5602,19 +5633,24 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#info_type_size">info_type_size</a><span>, in § 3.7.7</span>
    <li><a href="#integrated_loudness">integrated_loudness</a><span>, in § 3.7.7</span>
    <li><a href="#language_label">language_label</a><span>, in § 3.7</span>
+   <li><a href="#layout">Layout()</a><span>, in § 3.7.6</span>
    <li><a href="#layout_type">layout_type</a><span>, in § 3.7.6</span>
    <li><a href="#loudness">loudness</a><span>, in § 3.7</span>
    <li><a href="#loudnessinfo">LoudnessInfo()</a><span>, in § 3.7.7</span>
    <li><a href="#loudness_layout">loudness_layout</a><span>, in § 3.7</span>
    <li><a href="#loudspeaker_layout">loudspeaker_layout</a><span>, in § 3.6.2</span>
    <li><a href="#mix_gain">mix_gain</a><span>, in § 3.7.4</span>
-   <li><a href="#mix_gain_parameter_data">mix_gain_parameter_data</a><span>, in § 3.8.1</span>
+   <li><a href="#mixgainparamdefinition">MixGainParamDefinition()</a><span>, in § 3.7.4</span>
+   <li><a href="#mix_gain_parameter_data">mix_gain_parameter_data</a><span>, in § 3.8</span>
+   <li><a href="#mixgainparameterdata">MixGainParameterData()</a><span>, in § 3.8.1</span>
    <li><a href="#mix-presentation">Mix Presentation</a><span>, in § 2.1</span>
    <li><a href="#mix_presentation_annotations">mix_presentation_annotations</a><span>, in § 3.7</span>
+   <li><a href="#mixpresentationannotations">MixPresentationAnnotations()</a><span>, in § 3.7.1</span>
    <li><a href="#mix_presentation_element_annotations">mix_presentation_element_annotations</a><span>, in § 3.7</span>
+   <li><a href="#mixpresentationelementannotations">MixPresentationElementAnnotations()</a><span>, in § 3.7.2</span>
    <li><a href="#mix_presentation_friendly_label">mix_presentation_friendly_label</a><span>, in § 3.7.1</span>
    <li><a href="#mix_presentation_id">mix_presentation_id</a><span>, in § 3.7</span>
-   <li><a href="#mix-presentation-obu">Mix Presentation OBU</a><span>, in § 2.3.2.1</span>
+   <li><a href="#mix-presentation-obu">Mix Presentation OBU</a><span>, in § 3.7</span>
    <li><a href="#n-i">n(i)</a><span>, in § 3.8.3</span>
    <li><a href="#non-coupled-channels">Non-coupled channels</a><span>, in § 3.6.2</span>
    <li><a href="#num_audio_elements">num_audio_elements</a><span>, in § 3.7</span>
@@ -5633,6 +5669,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#num_sub_mixes">num_sub_mixes</a><span>, in § 3.7</span>
    <li><a href="#num_substreams">num_substreams</a><span>, in § 3.6</span>
    <li><a href="#obu_extension_flag">obu_extension_flag</a><span>, in § 3.2</span>
+   <li><a href="#obu-header">OBU Header</a><span>, in § 3.2</span>
    <li><a href="#obu_redundant_copy">obu_redundant_copy</a><span>, in § 3.2</span>
    <li><a href="#obus">obus</a><span>, in § 6.2.4</span>
    <li><a href="#obu_size">obu_size</a><span>, in § 3.2</span>
@@ -5643,6 +5680,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#output_gain_flags">output_gain_flags</a><span>, in § 3.6.2</span>
    <li><a href="#output_gain_is_present_flag">output_gain_is_present_flag</a><span>, in § 3.6.2</span>
    <li><a href="#output_mix_config">output_mix_config</a><span>, in § 3.7</span>
+   <li><a href="#outputmixconfig">OutputMixConfig()</a><span>, in § 3.7.5</span>
    <li><a href="#output_mix_gain">output_mix_gain</a><span>, in § 3.7.5</span>
    <li><a href="#param_data">param_data</a><span>, in § 3.8.1</span>
    <li><a href="#paramdefinition">ParamDefinition()</a><span>, in § 3.6.1</span>
@@ -5650,7 +5688,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#param_definition_mode">param_definition_mode</a><span>, in § 3.6.1</span>
    <li><a href="#param_definition_size">param_definition_size</a><span>, in § 3.6</span>
    <li><a href="#param_definition_type">param_definition_type</a><span>, in § 3.6</span>
-   <li><a href="#parameter-block-obu">Parameter Block OBU</a><span>, in § 2.3.2.2</span>
+   <li><a href="#parameter-block-obu">Parameter Block OBU</a><span>, in § 3.8</span>
    <li><a href="#parameter_data_bytes">parameter_data_bytes</a><span>, in § 3.8</span>
    <li><a href="#parameter_data_size">parameter_data_size</a><span>, in § 3.8</span>
    <li>
@@ -5665,13 +5703,17 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#recon_gain">recon_gain</a><span>, in § 3.8.3</span>
    <li><a href="#recon_gain_flags">recon_gain_flags</a><span>, in § 3.8.3</span>
    <li><a href="#recon_gain_info">recon_gain_info</a><span>, in § 3.6</span>
-   <li><a href="#recon_gain_info_parameter_data">recon_gain_info_parameter_data</a><span>, in § 3.8.3</span>
+   <li><a href="#recon_gain_info_parameter_data">recon_gain_info_parameter_data</a><span>, in § 3.8</span>
+   <li><a href="#recongaininfoparameterdata">ReconGainInfoParameterData()</a><span>, in § 3.8.3</span>
    <li><a href="#recon_gain_is_present_flag">recon_gain_is_present_flag</a><span>, in § 3.6.2</span>
+   <li><a href="#recongainparamdefinition">ReconGainParamDefinition()</a><span>, in § 3.6</span>
    <li><a href="#rendered-mix-presentation">Rendered Mix Presentation</a><span>, in § 2.1</span>
    <li><a href="#rendering_config">rendering_config</a><span>, in § 3.7</span>
+   <li><a href="#renderingconfig">RenderingConfig()</a><span>, in § 3.7.3</span>
    <li><a href="#rendering_config_extension_bytes">rendering_config_extension_bytes</a><span>, in § 3.7.3</span>
    <li><a href="#rendering_config_extension_size">rendering_config_extension_size</a><span>, in § 3.7.3</span>
    <li><a href="#reserved">reserved</a><span>, in § 3.7.3</span>
+   <li><a href="#reserved-obu">Reserved OBU</a><span>, in § 3.3</span>
    <li><a href="#s1to2-de-mixer">S1to2 de-mixer</a><span>, in § 7.2.2</span>
    <li><a href="#s2to1-encoder">S2to1 encoder</a><span>, in § 10.2.2</span>
    <li><a href="#s2to3-de-mixer">S2to3 de-mixer</a><span>, in § 7.2.2</span>
@@ -5684,6 +5726,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#sample_rate">sample_rate</a><span>, in § 3.11.4</span>
    <li><a href="#sample_size">sample_size</a><span>, in § 3.11.4</span>
    <li><a href="#scalable_channel_layout_config">scalable_channel_layout_config</a><span>, in § 3.6</span>
+   <li><a href="#scalablechannellayoutconfig">ScalableChannelLayoutConfig()</a><span>, in § 3.6.2</span>
    <li><a href="#sound_system">sound_system</a><span>, in § 3.7.6</span>
    <li><a href="#start_point_value">start_point_value</a><span>, in § 3.8.1</span>
    <li>
@@ -5696,7 +5739,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#t2to4-de-mixer">T2to4 de-mixer</a><span>, in § 7.2.2</span>
    <li><a href="#t2totf2-encoder">T2toTF2 encoder</a><span>, in § 10.2.2</span>
    <li><a href="#t4to2-encoder">T4to2 encoder</a><span>, in § 10.2.2</span>
-   <li><a href="#temporal-delimiter-obu">Temporal Delimiter OBU</a><span>, in § 2.3.2.2</span>
+   <li><a href="#temporal-delimiter-obu">Temporal Delimiter OBU</a><span>, in § 3.10</span>
    <li><a href="#temporal-unit">Temporal Unit</a><span>, in § 2.4</span>
    <li><a href="#tf2tot2-de-mixer">TF2toT2 de-mixer</a><span>, in § 7.2.2</span>
    <li><a href="#true_peak">true_peak</a><span>, in § 3.7.7</span>
@@ -6264,22 +6307,16 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
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 window.dfnpanelData['paramdefinition-parameter_id'] = {"dfnID": "paramdefinition-parameter_id", "url": "#paramdefinition-parameter_id", "dfnText": "parameter_id", "refSections": [{"refs": [{"id": "ref-for-paramdefinition-parameter_id"}, {"id": "ref-for-paramdefinition-parameter_id\u2460"}], "title": "3.6. Audio Element OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-paramdefinition-parameter_id\u2461"}], "title": "3.6.1. Parameter Definition Syntax and Semantics"}, {"refs": [{"id": "ref-for-paramdefinition-parameter_id\u2462"}, {"id": "ref-for-paramdefinition-parameter_id\u2463"}, {"id": "ref-for-paramdefinition-parameter_id\u2464"}], "title": "8.4.1. Two Audio Elements with One Codec Config"}], "external": false};
@@ -6318,6 +6363,8 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
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 window.dfnpanelData['paramdefinition-num_subblocks'] = {"dfnID": "paramdefinition-num_subblocks", "url": "#paramdefinition-num_subblocks", "dfnText": "num_subblocks", "refSections": [{"refs": [{"id": "ref-for-paramdefinition-num_subblocks"}, {"id": "ref-for-paramdefinition-num_subblocks\u2460"}], "title": "3.6. Audio Element OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-paramdefinition-num_subblocks\u2461"}, {"id": "ref-for-paramdefinition-num_subblocks\u2462"}, {"id": "ref-for-paramdefinition-num_subblocks\u2463"}, {"id": "ref-for-paramdefinition-num_subblocks\u2464"}], "title": "3.6.1. Parameter Definition Syntax and Semantics"}, {"refs": [{"id": "ref-for-paramdefinition-num_subblocks\u2465"}], "title": "3.8. Parameter Block OBU Syntax and Semantics"}], "external": false};
 window.dfnpanelData['paramdefinition-subblock_duration'] = {"dfnID": "paramdefinition-subblock_duration", "url": "#paramdefinition-subblock_duration", "dfnText": "subblock_duration", "refSections": [{"refs": [{"id": "ref-for-paramdefinition-subblock_duration"}, {"id": "ref-for-paramdefinition-subblock_duration\u2460"}, {"id": "ref-for-paramdefinition-subblock_duration\u2461"}, {"id": "ref-for-paramdefinition-subblock_duration\u2462"}, {"id": "ref-for-paramdefinition-subblock_duration\u2463"}], "title": "3.6.1. Parameter Definition Syntax and Semantics"}, {"refs": [{"id": "ref-for-paramdefinition-subblock_duration\u2464"}], "title": "3.8. Parameter Block OBU Syntax and Semantics"}], "external": false};
+window.dfnpanelData['scalablechannellayoutconfig'] = {"dfnID": "scalablechannellayoutconfig", "url": "#scalablechannellayoutconfig", "dfnText": "ScalableChannelLayoutConfig()", "refSections": [{"refs": [{"id": "ref-for-scalablechannellayoutconfig"}], "title": "3.6. Audio Element OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-scalablechannellayoutconfig\u2460"}, {"id": "ref-for-scalablechannellayoutconfig\u2461"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}], "external": false};
+window.dfnpanelData['channelaudiolayerconfig'] = {"dfnID": "channelaudiolayerconfig", "url": "#channelaudiolayerconfig", "dfnText": "ChannelAudioLayerConfig()", "refSections": [{"refs": [{"id": "ref-for-channelaudiolayerconfig"}, {"id": "ref-for-channelaudiolayerconfig\u2460"}, {"id": "ref-for-channelaudiolayerconfig\u2461"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}], "external": false};
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 window.dfnpanelData['channel_audio_layer_config'] = {"dfnID": "channel_audio_layer_config", "url": "#channel_audio_layer_config", "dfnText": "channel_audio_layer_config", "refSections": [{"refs": [{"id": "ref-for-channel_audio_layer_config"}, {"id": "ref-for-channel_audio_layer_config\u2460"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-channel_audio_layer_config\u2461"}], "title": "7.2.1. Gain"}, {"refs": [{"id": "ref-for-channel_audio_layer_config\u2462"}], "title": "8. IAMF Generation Process (Informative)"}, {"refs": [{"id": "ref-for-channel_audio_layer_config\u2463"}], "title": "8.2. Scalable Channel Audio Encoding"}], "external": false};
 window.dfnpanelData['loudspeaker_layout'] = {"dfnID": "loudspeaker_layout", "url": "#loudspeaker_layout", "dfnText": "loudspeaker_layout", "refSections": [{"refs": [{"id": "ref-for-loudspeaker_layout"}, {"id": "ref-for-loudspeaker_layout\u2460"}, {"id": "ref-for-loudspeaker_layout\u2461"}], "title": "3.6. Audio Element OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2462"}, {"id": "ref-for-loudspeaker_layout\u2463"}, {"id": "ref-for-loudspeaker_layout\u2464"}, {"id": "ref-for-loudspeaker_layout\u2465"}, {"id": "ref-for-loudspeaker_layout\u2466"}, {"id": "ref-for-loudspeaker_layout\u2467"}, {"id": "ref-for-loudspeaker_layout\u2468"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u24ea"}], "title": "3.7.3. Rendering Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u2460"}, {"id": "ref-for-loudspeaker_layout\u2460\u2461"}], "title": "3.7.6. Layout Syntax and Semantics"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u2462"}], "title": "3.8.2. Demixing Info Parameter Data Syntax and Semantics"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u2463"}], "title": "7.2. Scalable Channel Audio Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u2464"}], "title": "7.3.1. Selecting a Mix Presentation"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2460\u2465"}, {"id": "ref-for-loudspeaker_layout\u2460\u2466"}, {"id": "ref-for-loudspeaker_layout\u2460\u2467"}, {"id": "ref-for-loudspeaker_layout\u2460\u2468"}], "title": "7.3.2.1. Rendering a Channel-Based Audio Element to Loudspeakers"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2461\u24ea"}, {"id": "ref-for-loudspeaker_layout\u2461\u2460"}], "title": "7.3.2.1.2. Configuring the EAR Direct Speakers Renderer (Informative)"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2461\u2461"}, {"id": "ref-for-loudspeaker_layout\u2461\u2462"}], "title": "8. IAMF Generation Process (Informative)"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2461\u2463"}], "title": "8.2. Scalable Channel Audio Encoding"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2461\u2464"}], "title": "10.2.2. Annex B-2: Down-mix Mechanism (Informative)"}, {"refs": [{"id": "ref-for-loudspeaker_layout\u2461\u2465"}], "title": "10.2.3. Annex B-3: Channel Layout Generation Rule (Normative)"}], "external": false};
@@ -6331,10 +6378,12 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
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 window.dfnpanelData['output_gain_flags'] = {"dfnID": "output_gain_flags", "url": "#output_gain_flags", "dfnText": "output_gain_flags", "refSections": [{"refs": [{"id": "ref-for-output_gain_flags"}, {"id": "ref-for-output_gain_flags\u2460"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-output_gain_flags\u2461"}], "title": "7.2. Scalable Channel Audio Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-output_gain_flags\u2462"}, {"id": "ref-for-output_gain_flags\u2463"}], "title": "8.2. Scalable Channel Audio Encoding"}], "external": false};
 window.dfnpanelData['output_gain'] = {"dfnID": "output_gain", "url": "#output_gain", "dfnText": "output_gain", "refSections": [{"refs": [{"id": "ref-for-output_gain"}, {"id": "ref-for-output_gain\u2460"}, {"id": "ref-for-output_gain\u2461"}, {"id": "ref-for-output_gain\u2462"}], "title": "3.6.2. Scalable Channel Layout Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-output_gain\u2463"}], "title": "7.2. Scalable Channel Audio Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-output_gain\u2464"}, {"id": "ref-for-output_gain\u2465"}, {"id": "ref-for-output_gain\u2466"}], "title": "7.2.1. Gain"}, {"refs": [{"id": "ref-for-output_gain\u2467"}, {"id": "ref-for-output_gain\u2468"}, {"id": "ref-for-output_gain\u2460\u24ea"}], "title": "8.2. Scalable Channel Audio Encoding"}], "external": false};
-window.dfnpanelData['ambisonics_mode'] = {"dfnID": "ambisonics_mode", "url": "#ambisonics_mode", "dfnText": "ambisonics_mode", "refSections": [{"refs": [{"id": "ref-for-ambisonics_mode"}], "title": "3.6.3. Ambisonics Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-ambisonics_mode\u2460"}], "title": "7.1. Ambisonics Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-ambisonics_mode\u2461"}, {"id": "ref-for-ambisonics_mode\u2462"}, {"id": "ref-for-ambisonics_mode\u2463"}], "title": "8.1. Ambisonics Encoding"}], "external": false};
+window.dfnpanelData['ambisonicsconfig'] = {"dfnID": "ambisonicsconfig", "url": "#ambisonicsconfig", "dfnText": "AmbisonicsConfig()", "refSections": [{"refs": [{"id": "ref-for-ambisonicsconfig"}], "title": "3.6. Audio Element OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-ambisonicsconfig\u2460"}], "title": "3.6.3. Ambisonics Config Syntax and Semantics"}], "external": false};
+window.dfnpanelData['ambisonics_mode'] = {"dfnID": "ambisonics_mode", "url": "#ambisonics_mode", "dfnText": "ambisonics_mode", "refSections": [{"refs": [{"id": "ref-for-ambisonics_mode"}, {"id": "ref-for-ambisonics_mode\u2460"}, {"id": "ref-for-ambisonics_mode\u2461"}], "title": "3.6.3. Ambisonics Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-ambisonics_mode\u2462"}], "title": "7.1. Ambisonics Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-ambisonics_mode\u2463"}, {"id": "ref-for-ambisonics_mode\u2464"}, {"id": "ref-for-ambisonics_mode\u2465"}], "title": "8.1. Ambisonics Encoding"}], "external": false};
 window.dfnpanelData['output_channel_count'] = {"dfnID": "output_channel_count", "url": "#output_channel_count", "dfnText": "output_channel_count", "refSections": [{"refs": [{"id": "ref-for-output_channel_count"}], "title": "3.6.3. Ambisonics Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-output_channel_count\u2460"}], "title": "7.1. Ambisonics Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-output_channel_count\u2461"}], "title": "8.1. Ambisonics Encoding"}], "external": false};
 window.dfnpanelData['channel_mapping'] = {"dfnID": "channel_mapping", "url": "#channel_mapping", "dfnText": "channel_mapping", "refSections": [{"refs": [{"id": "ref-for-channel_mapping"}, {"id": "ref-for-channel_mapping\u2460"}], "title": "7.1. Ambisonics Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-channel_mapping\u2461"}], "title": "8.1. Ambisonics Encoding"}], "external": false};
 window.dfnpanelData['demixing_matrix'] = {"dfnID": "demixing_matrix", "url": "#demixing_matrix", "dfnText": "demixing_matrix", "refSections": [{"refs": [{"id": "ref-for-demixing_matrix"}, {"id": "ref-for-demixing_matrix\u2460"}], "title": "7.1. Ambisonics Decoding and Reconstruction"}, {"refs": [{"id": "ref-for-demixing_matrix\u2461"}], "title": "8.1. Ambisonics Encoding"}], "external": false};
+window.dfnpanelData['mix-presentation-obu'] = {"dfnID": "mix-presentation-obu", "url": "#mix-presentation-obu", "dfnText": "Mix Presentation OBU", "refSections": [{"refs": [{"id": "ref-for-mix-presentation-obu"}], "title": "2.3.2.1. Descriptors"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460"}, {"id": "ref-for-mix-presentation-obu\u2461"}, {"id": "ref-for-mix-presentation-obu\u2462"}], "title": "3.7. Mix Presentation OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2463"}], "title": "3.7.3. Rendering Config Syntax and Semantics"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2464"}, {"id": "ref-for-mix-presentation-obu\u2465"}, {"id": "ref-for-mix-presentation-obu\u2466"}], "title": "3.8. Parameter Block OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2467"}, {"id": "ref-for-mix-presentation-obu\u2468"}], "title": "4. Profiles"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u24ea"}], "title": "5.1.1. Descriptor OBUs"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u2460"}], "title": "6.2.3. IA Sample Entry"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u2461"}], "title": "8. IAMF Generation Process (Informative)"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u2462"}], "title": "8.2. Scalable Channel Audio Encoding"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u2463"}, {"id": "ref-for-mix-presentation-obu\u2460\u2464"}, {"id": "ref-for-mix-presentation-obu\u2460\u2465"}], "title": "8.3. Mix Presentation Encoding"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2460\u2466"}, {"id": "ref-for-mix-presentation-obu\u2460\u2467"}, {"id": "ref-for-mix-presentation-obu\u2460\u2468"}], "title": "8.4.1. Two Audio Elements with One Codec Config"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2461\u24ea"}, {"id": "ref-for-mix-presentation-obu\u2461\u2460"}, {"id": "ref-for-mix-presentation-obu\u2461\u2461"}, {"id": "ref-for-mix-presentation-obu\u2461\u2462"}], "title": "8.5.1. Loudness Information"}, {"refs": [{"id": "ref-for-mix-presentation-obu\u2461\u2463"}], "title": "10.1. Annex A: ID Linking Scheme (Informative)"}], "external": false};
 window.dfnpanelData['mix_presentation_id'] = {"dfnID": "mix_presentation_id", "url": "#mix_presentation_id", "dfnText": "mix_presentation_id", "refSections": [{"refs": [{"id": "ref-for-mix_presentation_id"}], "title": "3.7. Mix Presentation OBU Syntax and Semantics"}, {"refs": [{"id": "ref-for-mix_presentation_id\u2460"}], "title": "10.1. Annex A: ID Linking Scheme (Informative)"}], "external": false};
 window.dfnpanelData['count_label'] = {"dfnID": "count_label", "url": "#count_label", "dfnText": "count_label", "refSections": [{"refs": [{"id": "ref-for-count_label"}], "title": "3.7. Mix Presentation OBU Syntax and Semantics"}], "external": false};
 window.dfnpanelData['language_label'] = {"dfnID": "language_label", "url": "#language_label", "dfnText": "language_label", "refSections": [{"refs": [{"id": "ref-for-language_label"}], "title": "3.7. Mix Presentation OBU Syntax and Semantics"}], "external": false};
@@ -6344,47 +6393,62 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
 window.dfnpanelData['mix_presentation_obu-audio_element_id'] = {"dfnID": "mix_presentation_obu-audio_element_id", "url": "#mix_presentation_obu-audio_element_id", "dfnText": "audio_element_id", "refSections": [{"refs": [{"id": "ref-for-mix_presentation_obu-audio_element_id"}], "title": "7.3.1. Selecting a Mix Presentation"}, {"refs": [{"id": "ref-for-mix_presentation_obu-audio_element_id\u2460"}], "title": "8.4.1. Two Audio Elements with One Codec Config"}, {"refs": [{"id": "ref-for-mix_presentation_obu-audio_element_id\u2461"}, {"id": "ref-for-mix_presentation_obu-audio_element_id\u2462"}], "title": "10.1. Annex A: ID Linking Scheme (Informative)"}], "external": false};
 window.dfnpanelData['mix_presentation_element_annotations'] = {"dfnID": "mix_presentation_element_annotations", "url": "#mix_presentation_element_annotations", "dfnText": "mix_presentation_element_annotations", "refSections": [{"refs": [{"id": "ref-for-mix_presentation_element_annotations"}], "title": "3.7. Mix Presentation OBU Syntax and Semantics"}], "external": false};
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