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   <link href="https://aomediacodec.github.io/iamf/" rel="canonical">
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+  <meta content="3b4a136ae47dfa7b9aa59cc951d81d48361dde4f" name="document-revision">
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@@ -3667,23 +3667,31 @@ <h2 class="heading settled" data-level="4" id="profiles"><span class="secno">4.
    <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 class="note" role="note"><span class="marker">NOTE:</span> In this version of the specification, profiles impose constraints on how many codecs can be used in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③⑨">IA Sequence</a> but do not impose constraints on the actual codec used. In particular, this means that if a future version of the specification (or if a derived specification) defines how to use a new codec, the profiles defined in this specification could be used. Derived specifications may constrain the actual codec. The <a href="#codecsparameter">codecs parameter</a> may also be used in content negotiation phases to ensure that an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⓪">IA Sequence</a> is supported by a device.</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>In this context, for a given <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④①">IA Sequence</a> with <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile④">primary_profile</a> or <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile②">additional_profile</a> set to <a href="#profiles-simple">Simple Profile</a> or <a href="#profiles-base">Base Profile</a>, a <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu③">Reserved OBU</a> SHALL be regarded as either a part of a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①③">Descriptors</a> or a part of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit④">Temporal Unit</a> with the following restrictions:</p>
+   <ul>
+    <li data-md>
+     <p>The <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu④">Reserved OBU</a> SHALL not be present between <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑧">Mix Presentation OBU</a>s.</p>
+    <li data-md>
+     <p>A <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑨">Mix Presentation OBU</a> SHALL be the final OBU of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①④">Descriptors</a>.</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> <a href="#profiles-simple">Simple Profile</a> or <a href="#profiles-base">Base Profile</a> requires a <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu④">Temporal Delimiter OBU</a> to be the first OBU of a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑤">Temporal Unit</a> if the OBU is present. This restriction can be used to identify which <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑥">Temporal Unit</a> a <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu⑤">Reserved OBU</a> is a part of.</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-sequence④①">IA Sequence</a> for all profiles specified in this version of the specification:</p>
+   <p>Common restrictions on the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④②">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 <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_size③">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-sequence④②">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-sequence④③">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>
+     <p>There SHALL be only one unique set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑤">Descriptors</a> in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④③">IA Sequence</a>. If the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑥">Descriptors</a> are repeated in the middle of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④④">IA Sequence</a>, all the OBUs in that set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑦">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-sequence④④">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>
+       <p>When a set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑧">Descriptors</a> is placed in the middle of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑤">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-unit⑦">Temporal Unit</a>. In other words, if <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors①⑨">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-unit⑧">Temporal Unit</a> and before the first OBU of the next <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit⑨">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-obu⑥">Codec Config OBU</a>.</p>
     <li data-md>
-     <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-sequence④⑤">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>
+     <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-sequence④⑥">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-substream②⑨">Parameter Substream</a> in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑥">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>
+     <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-sequence④⑦">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-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>
@@ -3693,7 +3701,7 @@ <h2 class="heading settled" data-level="4" id="profiles"><span class="secno">4.
        </ul>
      </ul>
     <li data-md>
-     <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>
+     <p>In every <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⓪">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-obu②⑨">Parameter Block OBU</a>s.</p>
@@ -3701,28 +3709,28 @@ <h2 class="heading settled" data-level="4" id="profiles"><span class="secno">4.
        <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. <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>
+     <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-obu①⓪">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. <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>
+     <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-obu①①">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_layers⑧">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-obu①⑦">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>
+    <li data-md>
+     <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-unit①①">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>
    </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>When the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile④">primary_profile</a> field is set to 0, the following constraints apply to the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑦">IA Sequence</a>:</p>
+   <p>When the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑤">primary_profile</a> field is set to 0, the following constraints apply to 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 only one unique <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑧">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-obu④">Temporal Delimiter OBU</a>s present.</p>
    </ul>
    <p>Capabilities of the IA parser, decoder, and processor:</p>
    <ul>
     <li data-md>
-     <p>They SHALL be able to parse an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑧">IA Sequence</a> with <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑤">primary_profile</a> = 0.</p>
+     <p>They SHALL be able to parse an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑨">IA Sequence</a> with <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑥">primary_profile</a> = 0.</p>
     <li data-md>
      <p>They SHALL be able to handle up to 16 channels.</p>
     <li data-md>
@@ -3732,7 +3740,7 @@ <h3 class="heading settled" data-level="4.1" id="profiles-simple"><span class="s
    </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>When the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑥">primary_profile</a> field is set to 1, the following constraints apply to the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④⑨">IA Sequence</a>:</p>
+   <p>When the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑦">primary_profile</a> field is set to 1, the following constraints apply to the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⓪">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-obu①⑨">Audio Element OBU</a>s.</p>
@@ -3754,15 +3762,13 @@ <h3 class="heading settled" data-level="4.2" id="profiles-base"><span class="sec
          <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_layers①⑤">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-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>
    </ul>
    <p>Capabilities of the IA parser, decoder, and processor:</p>
    <ul>
     <li data-md>
      <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 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> = 1.</p>
+     <p>They SHALL be able to parse an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤①">IA Sequence</a> with <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑧">primary_profile</a> = 1.</p>
     <li data-md>
      <p>They SHALL be able to handle up to 18 channels.</p>
      <ul>
@@ -3779,15 +3785,15 @@ <h3 class="heading settled" data-level="4.2" id="profiles-base"><span class="sec
    <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 <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>
+   <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-descriptors②⓪">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-descriptors②①">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-sequence⑤②">IA Sequence</a>, each OBU in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②②">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-sequence⑤③">IA Sequence</a>.</p>
    <center><img height="445" src="images/IA sequence.png" style="width:100%; height:auto;" width="1430"></center>
    <center>
     <figcaption>Example of an Immersive Audio Sequence</figcaption>
    </center>
    <h4 class="heading settled" data-level="5.1.1" id="standalone-descriptor-obus"><span class="secno">5.1.1. </span><span class="content">Descriptor OBUs</span><a class="self-link" href="#standalone-descriptor-obus"></a></h4>
-    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: 
+    A set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②③">Descriptors</a> SHALL be placed in the following order regardless of where they appear in the bitstream and it MAY contain one or more <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu⑥">Reserved OBU</a>s. The locations of <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu⑦">Reserved OBU</a>s SHALL comply with those specified in <a href="#profiles">§ 4 Profiles</a>. 
    <ol>
     <li data-md>
      <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>
@@ -3796,7 +3802,7 @@ <h4 class="heading settled" data-level="5.1.1" id="standalone-descriptor-obus"><
     <li data-md>
      <p>All <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>All <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⓪">Mix Presentation OBU</a>s</p>
+     <p>All <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①②">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-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>
@@ -3806,9 +3812,9 @@ <h4 class="heading settled" data-level="5.1.2" id="standalone-iadata-obus"><span
     <li data-md>
      <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-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>
+     <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-unit①②">Temporal Unit</a>.</p>
     <li data-md>
-     <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>
+     <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-unit①③">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-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>
@@ -3818,9 +3824,9 @@ <h4 class="heading settled" data-level="5.1.2" id="standalone-iadata-obus"><span
      <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 <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>
+   <p>If the IAMF configuration changes, a new set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②④">Descriptors</a> is REQUIRED. In that case, a new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤④">IA Sequence</a> of the complete set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑤">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-descriptors②⑥">Descriptors</a> of the new <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑤">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-descriptors②⑦">Descriptors</a> of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑥">IA Sequence</a> are all marked as non-redundant. When two <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑦">IA Sequence</a>s are concatenated, every OBU in the first <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑧">Descriptors</a> of the second <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑧">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>
    <p>A file conformant to this specification satisfies the following:</p>
@@ -3838,12 +3844,12 @@ <h3 class="heading settled" data-level="6.1" id="brands"><span class="secno">6.1
    </ul>
    <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦⑤">iso6</a></code> brand and MAY support structures required by further ISO-BMFF structural brands.</p>
    <h3 class="heading settled" data-level="6.2" id="isobmff-singletrack"><span class="secno">6.2. </span><span class="content">ISO-BMFF IAMF Encapsulation</span><a class="self-link" href="#isobmff-singletrack"></a></h3>
-   <p>This section describes the basic data structures used to signal encapsulation of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑧">IA Sequence</a> in <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> containers.</p>
+   <p>This section describes the basic data structures used to signal encapsulation of an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑨">IA Sequence</a> in <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> containers.</p>
    <h4 class="heading settled" data-level="6.2.1" id="isobmff-singletrack-iasequence"><span class="secno">6.2.1. </span><span class="content">Requirement of IA Sequence</span><a class="self-link" href="#isobmff-singletrack-iasequence"></a></h4>
-   <p>Even though an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑤⑨">IA Sequence</a> can theoretically group audio data coded with different codecs, potentially with different timing properties, which would require multiple tracks, this version of the specification only supports storing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⓪">IA Sequence</a> as a single track thanks to the restrictions of the selected profiles.</p>
-   <p>In this version of the specification, <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-track">IA Track</dfn> means the track storing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥①">IA Sequence</a>.</p>
+   <p>Even though an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⓪">IA Sequence</a> can theoretically group audio data coded with different codecs, potentially with different timing properties, which would require multiple tracks, this version of the specification only supports storing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥①">IA Sequence</a> as a single track thanks to the restrictions of the selected profiles.</p>
+   <p>In this version of the specification, <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-track">IA Track</dfn> means the track storing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥②">IA Sequence</a>.</p>
    <h4 class="heading settled" data-level="6.2.2" id="isobmff-singletrack-basicencapsulationscheme"><span class="secno">6.2.2. </span><span class="content">Encapsulation Scheme</span><a class="self-link" href="#isobmff-singletrack-basicencapsulationscheme"></a></h4>
-   <p>The result of encapsulating an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥②">IA Sequence</a> into an <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> file is as follows:</p>
+   <p>The result of encapsulating an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥③">IA Sequence</a> into an <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> file is as follows:</p>
    <ul>
     <li data-md>
      <p>If there are audio samples to be trimmed at the start or at the end, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦⑥">edts</a> and <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦⑦">elst</a> boxes SHALL be present to reflect the trimming status.</p>
@@ -3851,10 +3857,10 @@ <h4 class="heading settled" data-level="6.2.2" id="isobmff-singletrack-basicenca
      <p>Sample Entry</p>
      <ul>
       <li data-md>
-       <p>An <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample">IA Sample</a> is associated with only one sample entry, and the <a data-link-type="dfn" href="#configobus" id="ref-for-configobus">configOBUs</a> in that sample entry SHALL contain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑦">Descriptors</a> required to process the <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①">IA Sample</a>. If a different set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑧">Descriptors</a> is needed, a new sample entry SHALL be defined.</p>
+       <p>An <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample">IA Sample</a> is associated with only one sample entry, and the <a data-link-type="dfn" href="#configobus" id="ref-for-configobus">configOBUs</a> in that sample entry SHALL contain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑨">Descriptors</a> required to process the <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample①">IA Sample</a>. If a different set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a> is needed, a new sample entry SHALL be defined.</p>
      </ul>
    </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Multiple sample entries may be used in a track, for example when the track is the concatenation of multiple tracks or multiple <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥③">IA Sequence</a>s, and some <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample②">IA Sample</a>s have different <a data-link-type="dfn" href="#configobus" id="ref-for-configobus①">configOBUs</a> values.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Multiple sample entries may be used in a track, for example when the track is the concatenation of multiple tracks or multiple <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥④">IA Sequence</a>s, and some <a data-link-type="dfn" href="#ia-sample" id="ref-for-ia-sample②">IA Sample</a>s have different <a data-link-type="dfn" href="#configobus" id="ref-for-configobus①">configOBUs</a> values.</p>
    <ul>
     <li data-md>
      <p>Decoding Time to IA Sample</p>
@@ -3893,7 +3899,7 @@ <h4 class="heading settled" data-level="6.2.3" id="iasampleentry-section"><span
 The <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑤">samplerate</a> field of <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑥">AudioSampleEntry</a> SHALL be set to 0. There SHALL be no <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑦">SamplingRateBox</a>.
 Parsers SHALL ignore these two fields.</p>
    <p><b>Semantics</b></p>
-   <p><dfn data-dfn-type="dfn" data-noexport id="ia_configuration_box">ia_configuration_box<a class="self-link" href="#ia_configuration_box"></a></dfn> is an instance of the IAConfigurationBox() class, which provides the configuration of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥④">IA Sequence</a>. The position of the instance SHALL comply with the rule specified in <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> for <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑧">AudioSampleEntry</a>. In other words, the instance SHALL be present after the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑨">samplerate</a> field of <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨⓪">AudioSampleEntry</a>. When the instance is present with another optional box such as the BitRateBox() (<a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨①">btrt</a>), their exact ordering is not defined.</p>
+   <p><dfn data-dfn-type="dfn" data-noexport id="ia_configuration_box">ia_configuration_box<a class="self-link" href="#ia_configuration_box"></a></dfn> is an instance of the IAConfigurationBox() class, which provides the configuration of the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑤">IA Sequence</a>. The position of the instance SHALL comply with the rule specified in <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a> for <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑧">AudioSampleEntry</a>. In other words, the instance SHALL be present after the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧⑨">samplerate</a> field of <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨⓪">AudioSampleEntry</a>. When the instance is present with another optional box such as the BitRateBox() (<a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨①">btrt</a>), their exact ordering is not defined.</p>
    <h4 class="heading settled" data-level="6.2.4" id="iaconfigurationbox-section"><span class="secno">6.2.4. </span><span class="content">IA Configuration Box</span><a class="self-link" href="#iaconfigurationbox-section"></a></h4>
 <pre class="def">Sample Entry Type: <dfn data-dfn-for="IAConfigurationBox" data-dfn-type="dfn" data-export id="iaconfigurationbox-iacb">iacb<a class="self-link" href="#iaconfigurationbox-iacb"></a></dfn>
 Container:         IA Sample Entry ('iamf')
@@ -3910,7 +3916,7 @@ <h4 class="heading settled" data-level="6.2.4" id="iaconfigurationbox-section"><
    <p><b>Semantics</b></p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="configurationversion">configurationVersion</dfn> indicates the version of the IAConfigurationBox. The value SHALL be set to 1 for this version of the specification. The box with which <a data-link-type="dfn" href="#configurationversion" id="ref-for-configurationversion">configurationVersion</a> is not set to 1 SHALL be ignored by parsers compliant with this version of the specification.</p>
    <p><dfn data-dfn-type="dfn" data-noexport id="configobus_size">configOBUs_size<a class="self-link" href="#configobus_size"></a></dfn> SHALL be set to the size of <a data-link-type="dfn" href="#configobus" id="ref-for-configobus③">configOBUs</a> in bytes.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="configobus">configOBUs</dfn> SHALL contain the following OBUs in order.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="configobus">configOBUs</dfn> SHALL contain the following OBUs in order and it MAY contain one or more <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu⑧">Reserved OBU</a>s. The locations of <a data-link-type="dfn" href="#reserved-obu" id="ref-for-reserved-obu⑨">Reserved OBU</a>s SHALL comply with those specified in <a href="#profiles">§ 4 Profiles</a>.</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑨">IA Sequence Header OBU</a></p>
@@ -3919,9 +3925,9 @@ <h4 class="heading settled" data-level="6.2.4" id="iaconfigurationbox-section"><
     <li data-md>
      <p>One or more <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②①">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-obu①①">Mix Presentation OBU</a>s</p>
+     <p>One or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①③">Mix Presentation OBU</a>s</p>
    </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> In practice, <a data-link-type="dfn" href="#configobus" id="ref-for-configobus④">configOBUs</a> is identical to <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑨">Descriptors</a>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> In practice, <a data-link-type="dfn" href="#configobus" id="ref-for-configobus④">configOBUs</a> is identical to <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③①">Descriptors</a>.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> Future versions of the specification may define fields after the signaled end of <a data-link-type="dfn" href="#configobus" id="ref-for-configobus⑤">configOBUs</a>. Parsers compliant with this version of the specification can safely ignore them.</p>
    <h4 class="heading settled" data-level="6.2.5" id="iasampleformat"><span class="secno">6.2.5. </span><span class="content">IA Sample Format</span><a class="self-link" href="#iasampleformat"></a></h4>
    <p><b>Syntax</b></p>
@@ -3930,27 +3936,27 @@ <h4 class="heading settled" data-level="6.2.5" 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-unit①①">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-unit①④">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-something⑨②">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-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>
+     <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-unit①⑤">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-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>
+     <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-unit①⑥">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-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-sequence⑥⑤">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-sequence⑥⑥">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-sequence⑥⑦">IA Sequence</a>s may need multiple edits in the edit list.</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-sequence⑥⑥">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-sequence⑥⑦">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-sequence⑥⑧">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-something⑨③">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>
    <ul>
     <li data-md>
      <p>Per <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> and <a data-link-type="biblio" href="#biblio-iso-bmff" title="Information Technology - Coding of audio-visual objects - Part 12: ISO base media file format">[ISO-BMFF]</a>, the first element of the codecs parameter string is <code>iamf</code>.</p>
     <li data-md>
-     <p>The second element indicates the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑧">primary_profile</a>. It is three digits within the range of 0 to 255.</p>
+     <p>The second element indicates the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑨">primary_profile</a>. It is three digits within the range of 0 to 255.</p>
     <li data-md>
-     <p>The third element indicates the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile②">additional_profile</a>. It is three digits within the range of 0 to 255.</p>
+     <p>The third element indicates the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile③">additional_profile</a>. It is three digits within the range of 0 to 255.</p>
     <li data-md>
      <p>The fourth element and any additional elements, if any, SHALL be the elements of the codecs parameter string if that stream was carried in its own track (i.e., not encapsulated in IAMF).</p>
    </ul>
@@ -3979,20 +3985,20 @@ <h3 class="heading settled" data-level="6.3" id="codecsparameter"><span class="s
    </ul>
 <pre>iamf.xxx.yyy.ipcm
 </pre>
-   <p>where <code>xxx</code> is three digits to indicate the value of the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile⑨">primary_profile</a> and <code>yyy</code> is three digits to indicate the value of the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile③">additional_profile</a>.</p>
+   <p>where <code>xxx</code> is three digits to indicate the value of the <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①⓪">primary_profile</a> and <code>yyy</code> is three digits to indicate the value of the <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile④">additional_profile</a>.</p>
    <h3 class="heading settled" data-level="6.4" id="isobmff-decapsulation"><span class="secno">6.4. </span><span class="content">ISO-BMFF IAMF Decapsulation (Informative)</span><a class="self-link" href="#isobmff-decapsulation"></a></h3>
    <h4 class="heading settled" data-level="6.4.1" id="isobmff-decapsulation-singletrack"><span class="secno">6.4.1. </span><span class="content">Decapsulating an ISO-BMFF IAMF File with a Single Track</span><a class="self-link" href="#isobmff-decapsulation-singletrack"></a></h4>
-   <p>This section provides a guideline for IAMF parsers reconstructing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑧">IA Sequence</a> from an IAMF file with a single track.</p>
+   <p>This section provides a guideline for IAMF parsers reconstructing an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑨">IA Sequence</a> from an IAMF file with a single track.</p>
    <ol>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#configobus" id="ref-for-configobus⑥">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-sequence⑥⑨">IA Sequence</a>. These are the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a>.</p>
+     <p>The <a data-link-type="dfn" href="#configobus" id="ref-for-configobus⑥">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-sequence⑦⓪">IA Sequence</a>. These are the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③②">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-sequence⑦⓪">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>
+     <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-sequence⑦①">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-unit①⑦">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-obu①①">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦①">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>
+       <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-sequence⑦②">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-unit①⑧">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-obu①③">Temporal Delimiter OBU</a>s in the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦②">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-sequence⑦③">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>
@@ -4004,7 +4010,7 @@ <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-descriptors③①">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>
+     <p>The IAMF-ISO-BMFF parser passes the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">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-unit①⑨">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>
@@ -4020,10 +4026,10 @@ <h4 class="heading settled" data-level="6.4.2" id="isobmff-decapsulation-singlet
    </ul>
    <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7. </span><span class="content">IAMF Processing</span><a class="self-link" href="#processing"></a></h2>
    <p>This section is normative unless noted otherwise.</p>
-   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦③">IA Sequence</a> SHALL be decoded and processed to output an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑧">Immersive Audio</a> according to a given playback layout. It SHALL include the following steps but an IA decoder MAY process the steps in a different order to produce the same result:</p>
+   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦④">IA Sequence</a> SHALL be decoded and processed to output an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑧">Immersive Audio</a> according to a given playback layout. It SHALL include the following steps but an IA decoder MAY process the steps in a different order to produce the same result:</p>
    <ol>
     <li data-md>
-     <p>Parsing OBUs to obtain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③②">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data⑤">IA Data</a>.</p>
+     <p>Parsing OBUs to obtain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③④">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-presentation②④">Mix Presentation</a> to use.</p>
      <ul>
@@ -4077,7 +4083,7 @@ <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-sequence⑦④">IA Sequence</a> to output the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">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>
+     <p>The OBU parser depacketizes the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑤">IA Sequence</a> to output the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑤">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-substream⑧①">Audio Substream</a> outputs the decoded channels.</p>
     <li data-md>
@@ -4098,7 +4104,7 @@ <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-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-sequence⑦⑤">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-sequence⑦⑥">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_mode③">ambisonics_mode</a>) to the Channel Mapping/Demixing Matrix module.</p>
     <li data-md>
@@ -4290,11 +4296,11 @@ <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-sequence⑦⑥">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>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑦">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-sequence⑦⑦">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>
+   <p>When an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑧">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-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>
@@ -4719,7 +4725,7 @@ <h3 class="heading settled" data-level="8.3" 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="9" id="annex"><span class="secno">9. </span><span class="content">Annex</span><a class="self-link" href="#annex"></a></h2>
    <h3 class="heading settled" data-level="9.1" id="iamfgeneration"><span class="secno">9.1. </span><span class="content">Annex A: IAMF Generation Process (Informative)</span><a class="self-link" href="#iamfgeneration"></a></h3>
-   <p>This section provides a guideline for encoding an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑧">IA Sequence</a> that conforms to the <a href="#obu-syntax">§ 3 Open Bitstream Unit (OBU) Syntax and Semantics</a>, given a set of input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑦">3D audio signal</a> and user inputs.</p>
+   <p>This section provides a guideline for encoding an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑨">IA Sequence</a> that conforms to the <a href="#obu-syntax">§ 3 Open Bitstream Unit (OBU) Syntax and Semantics</a>, given a set of input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑦">3D audio signal</a> and user inputs.</p>
    <p>The preferred input audio formats for IA encoding are as follows:</p>
    <ul>
     <li data-md>
@@ -4744,7 +4750,7 @@ <h3 class="heading settled" data-level="9.1" id="iamfgeneration"><span class="se
     <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_layout②⑤">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-sequence⑦⑨">IA Sequence</a> with one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⑧">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-sequence⑧⓪">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>
@@ -4752,14 +4758,14 @@ <h3 class="heading settled" data-level="9.1" id="iamfgeneration"><span class="se
    <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-group⑤⑧">Channel Group</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③④">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-signal①⑧">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-group⑤⑧">Channel Group</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑥">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-signal①⑧">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-group⑤⑨">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-group⑥⓪">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-descriptors③⑤">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-obu②③">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>
+       <p>It outputs <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑦">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-obu②③">Audio Element OBU</a>, and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①④">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-substream③⑤">Parameter Substream</a>s</p>
        <ul>
@@ -4774,20 +4780,20 @@ <h3 class="heading settled" data-level="9.1" id="iamfgeneration"><span class="se
     <li data-md>
      <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-group⑥①">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-descriptors③⑥">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-sequence⑧⓪">IA Sequence</a>.</p>
+     <p>The OBU Packetizer packetizes <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑧">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-sequence⑧①">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-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>
+       <p>The Temporal Unit Generator generates a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⓪">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>
    <h4 class="heading settled" data-level="9.1.1" id="iamfgeneration-ambisonics"><span class="secno">9.1.1. </span><span class="content">Annex A1: Ambisonics Encoding (Informative)</span><a class="self-link" href="#iamfgeneration-ambisonics"></a></h4>
    <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-group⑥②">Channel Group</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑦">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-group⑥②">Channel Group</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑨">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-descriptors③⑧">Descriptors</a> based on the Ambisonics mode and the number of channels.</p>
+       <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⓪">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_mode④">ambisonics_mode</a> is set as follows:</p>
@@ -4812,7 +4818,7 @@ <h4 class="heading settled" data-level="9.1.1" id="iamfgeneration-ambisonics"><s
     <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-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-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>
+     <p>The i-th <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②①">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-obu①④">Temporal Delimiter OBU</a>.</p>
@@ -4822,7 +4828,7 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
    <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-group⑥⑤">Channel Group</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②④">num_layers</a> = N), <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-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>
+     <p>The Pre-Processor outputs N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑤">Channel Group</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②④">num_layers</a> = N), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④①">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_layers②⑤">num_layers</a> = 1):</p>
@@ -4845,10 +4851,10 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
       <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-group⑥⑦">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-descriptors④⓪">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④③">Parameter Substream</a>s.</p>
+       <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④②">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-descriptors④①">Descriptors</a> are set as follows:</p>
+         <p><a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④③">Descriptors</a> are set as follows:</p>
          <ul>
           <li data-md>
            <p><a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑦">num_layers</a> is set to N (i.e., the number of channel layouts).</p>
@@ -4876,7 +4882,7 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
            </ul>
          </ul>
         <li data-md>
-         <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-group⑧⓪">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-sequence⑧①">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-group⑧⓪">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-sequence⑧②">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_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>
@@ -4888,12 +4894,12 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
        </ul>
      </ul>
     <li data-md>
-     <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>
+     <p>The <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②②">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-obu①⑤">Temporal Delimiter OBU</a>.</p>
       <li data-md>
-       <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧②">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-group⑧③">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-group⑧④">Channel Group</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑤">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-group⑧②">Channel Group</a>s in a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②③">Temporal Unit</a> are placed in order. In other words, the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧③">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-group⑧④">Channel Group</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑤">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>
@@ -4921,7 +4927,7 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
     <li data-md>
      <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-descriptors④②">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-obu②④">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>
+     <p>The OBU Packetizer generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④④">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-obu②④">Audio Element OBU</a> and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑤">Mix Presentation OBU</a>.</p>
      <ul>
       <li data-md>
        <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>
@@ -4931,17 +4937,17 @@ <h4 class="heading settled" data-level="9.1.2" id="iamfgeneration-scalablechanne
     <li data-md>
      <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-unit②①">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-unit②④">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-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>
+       <p>A <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⑤">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-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-sequence⑧②">IA Sequence</a> which is composed of OBUs for <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④③">Descriptors</a>, followed by OBUs for <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②③">Temporal Unit</a>s.</p>
+     <p>The OBU Packetizer outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧③">IA Sequence</a> which is composed of OBUs for <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⑤">Descriptors</a>, followed by OBUs for <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⑥">Temporal Unit</a>s.</p>
    </ul>
    <h5 class="heading settled" data-level="9.1.2.1" id="iamfgeneration-scalablechannelaudio-downmixparameter"><span class="secno">9.1.2.1. </span><span class="content">Annex A2.1: Down-mix parameter and Loudness (Informative)</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio-downmixparameter"></a></h5>
    <p>This section describes how down-mix parameters and loudness levels can be generated for a given channel audio and a given list of channel layouts for scalability (i.e., <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑨">num_layers</a> > 1).</p>
@@ -5189,7 +5195,7 @@ <h5 class="heading settled" data-level="9.1.2.4" id="iamfgeneration-scalablechan
 \[c(k) = w(k) \times \delta(k) \times \alpha(k),\]
 \[d(k) = w(k) \times \delta(k) \times \beta(k).\]</p>
    <h4 class="heading settled" data-level="9.1.3" id="iamfgeneration-mixpresentation"><span class="secno">9.1.3. </span><span class="content">Annex A3: Mix Presentation Encoding (Informative)</span><a class="self-link" href="#iamfgeneration-mixpresentation"></a></h4>
-   <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>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑥">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>
@@ -5209,7 +5215,7 @@ <h4 class="heading settled" data-level="9.1.3" id="iamfgeneration-mixpresentatio
      </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_layers③⓪">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-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>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑦">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>
@@ -5232,7 +5238,7 @@ <h4 class="heading settled" data-level="9.1.3" id="iamfgeneration-mixpresentatio
     <li data-md>
      <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-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>
+   <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑧">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>
@@ -5257,17 +5263,17 @@ <h4 class="heading settled" data-level="9.1.3" id="iamfgeneration-mixpresentatio
    </ul>
    <h5 class="heading settled" data-level="9.1.3.1" id="iamfgeneration-mixpresentation-mix"><span class="secno">9.1.3.1. </span><span class="content">Annex A3.1:Element Mix Config (Informative)</span><a class="self-link" href="#iamfgeneration-mixpresentation-mix"></a></h5>
    <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-sequence⑧③">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-sequence⑧④">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>
+   <p>An IA multiplexer may merge two <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧④">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-sequence⑧⑤">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>
    <h4 class="heading settled" data-level="9.1.4" id="iamfgeneration-multipleaudioelements-onecodec"><span class="secno">9.1.4. </span><span class="content">Annex A4: Two Audio Elements Encoding with One Codec Config (Informative)</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-sequence⑧⑤">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-sequence⑧⑥">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-descriptors④④">Descriptors</a> are generated as follows:</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-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-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-descriptors④⑥">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-obu①②">IA Sequence Header OBU</a>: Both <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①⓪">primary_profile</a> and <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile④">additional_profile</a> fields are set to 1 to indicate the <a href="#profiles-base">Base Profile</a>.</p>
+     <p><a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu①②">IA Sequence Header OBU</a>: Both <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile①①">primary_profile</a> and <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile⑤">additional_profile</a> fields are set to 1 to indicate the <a href="#profiles-base">Base Profile</a>.</p>
     <li data-md>
-     <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-sequence⑧⑦">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-sequence⑧⑧">IA Sequence</a>s.</p>
     <li data-md>
-     <p>Two <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑤">Audio Element OBU</a>s: take both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑥">Audio Element OBU</a>s from both the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑧">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-obu②⑤">Audio Element OBU</a>s: take both <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②⑥">Audio Element OBU</a>s from both the input <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑧⑨">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-obu②⑦">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>
@@ -5276,18 +5282,18 @@ <h4 class="heading settled" data-level="9.1.4" id="iamfgeneration-multipleaudioe
       <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-obu②⑨">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-obu③⓪">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-sequence⑧⑨">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-obu③⓪">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-sequence⑨⓪">IA Sequence</a>.</p>
      </ul>
     <li data-md>
-     <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-element①③⓪">Audio Element</a>s.</p>
+     <p><a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu①⑨">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-element①③⓪">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-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-obu③①">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-obu②⓪">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-obu③①">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-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>
+       <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-obu②①">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-unit②④">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-unit②⑦">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-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-element①③①">Audio Element</a>s). Make the following modifications as needed:</p>
@@ -5295,23 +5301,23 @@ <h4 class="heading settled" data-level="9.1.4" id="iamfgeneration-multipleaudioe
       <li data-md>
        <p>The <a data-link-type="dfn" href="#obu_type" id="ref-for-obu_type⑨">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-obu③②">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_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-descriptors④⑤">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-descriptors④⑦">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-obu①⑦">Temporal Delimiter OBU</a>.</p>
    </ul>
-   <p>Step 3: Generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨⓪">IA Sequence</a> which starts with <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⑥">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>
+   <p>Step 3: Generate an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑨①">IA Sequence</a> which starts with <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④⑧">Descriptors</a> and is followed by <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②⑧">Temporal Unit</a>s, in order.</p>
    <h4 class="heading settled" data-level="9.1.5" id="iamfgeneration-postprocessing"><span class="secno">9.1.5. </span><span class="content">Annex A5: Post Processing (Informative)</span><a class="self-link" href="#iamfgeneration-postprocessing"></a></h4>
    <p>This section provides a way to generate metadata for post-processing.</p>
    <h5 class="heading settled" data-level="9.1.5.1" id="iamfgeneration-postprocessing-loudness"><span class="secno">9.1.5.1. </span><span class="content">Annex A5.1: Loudness Information (Informative)</span><a class="self-link" href="#iamfgeneration-postprocessing-loudness"></a></h5>
-   <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>
+   <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-obu②②">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-element①③②">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>
+     <p>Each <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③②">Audio Element</a> specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②③">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-element①③③">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>
+     <p>Each rendered <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-obu②④">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-element①③④">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>
+     <p>All rendered and processed <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③④">Audio Element</a>s specified in the given <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②⑤">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_config⑥">output_mix_config</a>.</p>
     <li data-md>
@@ -5328,7 +5334,7 @@ <h3 class="heading settled" data-level="9.2" id="idlinkingscheme"><span class="s
     <li data-md>
      <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_id②③">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-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>
+     <p>The <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu②⑥">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-element①③⑤">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.</p>
@@ -6332,9 +6338,9 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
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