diff --git a/src/spikegadgets_to_nwb/convert_analog.py b/src/spikegadgets_to_nwb/convert_analog.py
index e69de29..0b8a86b 100644
--- a/src/spikegadgets_to_nwb/convert_analog.py
+++ b/src/spikegadgets_to_nwb/convert_analog.py
@@ -0,0 +1,74 @@
+from hdmf.data_utils import GenericDataChunkIterator
+from hdmf.backends.hdf5 import H5DataIO
+import numpy as np
+import pynwb
+from pynwb import NWBFile
+from pynwb.ecephys import ElectricalSeries
+from warnings import warn
+from spikegadgets_to_nwb import convert_rec_header
+from spikegadgets_to_nwb.convert_ephys import RecFileDataChunkIterator
+
+from .spike_gadgets_raw_io import SpikeGadgetsRawIO
+
+
+def add_analog_data(nwbfile: NWBFile, rec_file_path: list[str], **kwargs) -> None:
+    """Adds analog streams to the nwb file.
+
+    Parameters
+    ----------
+    nwbfile : NWBFile
+        nwb file being assembled
+    recfile : list[str]
+        ordered list of file paths to all recfiles with session's data
+    """
+    # TODO: ADD HEADSTAGE DATA
+
+    # get the ids of the analog channels from the first rec file header
+    root = convert_rec_header.read_header(rec_file_path[0])
+    hconf = root.find("HardwareConfiguration")
+    ecu_conf = None
+    for conf in hconf:
+        if conf.attrib["name"] == "ECU":
+            ecu_conf = conf
+            break
+    analog_channel_ids = []
+    for channel in ecu_conf:
+        if channel.attrib["dataType"] == "analog":
+            analog_channel_ids.append(channel.attrib["id"])
+
+    # make the data chunk iterator
+    rec_dci = RecFileDataChunkIterator(
+        rec_file_path, nwb_hw_channel_order=analog_channel_ids
+    )
+
+    # (16384, 32) chunks of dtype int16 (2 bytes) is 1 MB, which is recommended
+    # by studies by the NWB team.
+    # could also add compression here. zstd/blosc-zstd are recommended by the NWB team, but
+    # they require the hdf5plugin library to be installed. gzip is available by default.
+    data_data_io = H5DataIO(rec_dci, chunks=(16384, min(rec_dci.n_channel, 32)))
+
+    # make the objects to add to the nwb file
+    nwbfile.create_processing_module(
+        name="analog", description="Contains all analog data"
+    )
+    analog_events = pynwb.behavior.BehavioralEvents(name="analog")
+    analog_events.add_timeseries(
+        pynwb.TimeSeries(
+            name="analog",
+            description=__merge_row_description(
+                analog_channel_ids
+            ),  # NOTE: matches rec_to_nwb system
+            data=data_data_io,
+            timestamps=rec_dci.timestamps,
+            unit="-1",
+        )
+    )
+    # add it to the nwb file
+    nwbfile.processing["analog"].add(analog_events)
+
+
+def __merge_row_description(row_ids: list[str]) -> str:
+    description = ""
+    for id in row_ids:
+        description += id + "   "
+    return description