ComfyUI: ModuleNotFoundError: No module named 'soundfile' (fix)

ModuleNotFoundError: No module named 'soundfile' in ComfyUI comes from comfyui-various when COMFYUI_JW_ENABLE_EXTRA_NODES=true loads its sound node but soundfile isn't installed in ComfyUI's Python. We reproduced it on v0.37.0 and fixed it.

1. The error

ComfyUI v0.37.0 (CPython 3.11, torch 2.9.0+cpu) with comfyui-various (commit ddf36c6) in custom_nodes/, started with COMFYUI_JW_ENABLE_EXTRA_NODES=true and without the soundfile package (traceback shortened):

[WARNING] Traceback (most recent call last):
  ...
  File "ComfyUI/custom_nodes/comfyui-various/__init__.py", line 78, in <module>
    load_nodes(module_name)
  File "ComfyUI/custom_nodes/comfyui-various/__init__.py", line 43, in load_nodes
    module = importlib.import_module(module_name, package=__name__)
  ...
  File "ComfyUI/custom_nodes/comfyui-various/comfyui_sound.py", line 7, in <module>
    import soundfile as sf
ModuleNotFoundError: No module named 'soundfile'

[WARNING] Cannot import ComfyUI/custom_nodes/comfyui-various module for custom nodes: No module named 'soundfile'

and in the startup summary:

[INFO]    0.0 seconds (IMPORT FAILED): ComfyUI/custom_nodes/comfyui-various

ComfyUI keeps running (exit code 0), but all comfyui-various nodes are gone, not just the sound ones: __init__.py imports its node modules one by one in a loop, so the first failing import aborts the whole package.

2. Why it only fails sometimes

comfyui_sound.py (line 7: import soundfile as sf) is in the package's "extra nodes" list, which __init__.py only loads when the environment variable COMFYUI_JW_ENABLE_EXTRA_NODES is true. Without the variable, the same install starts cleanly without soundfile. The repo has no requirements.txt, so neither ComfyUI-Manager nor pip install -r will install soundfile for you.

3. Fix: install soundfile into ComfyUI's Python

python -m pip install soundfile

This installed soundfile 0.14.0, whose Linux, macOS and Windows wheels bundle libsndfile (here 1.2.2), so no system package was needed. After a restart with the variable still set:

[INFO]    0.1 seconds: ComfyUI/custom_nodes/comfyui-various

Use the Python that runs main.py: activate the venv first, or on the Windows portable build run python_embeded\python.exe -m pip install soundfile from the ComfyUI_windows_portable folder. If you don't need the extra nodes, unsetting COMFYUI_JW_ENABLE_EXTRA_NODES also makes the error go away.

Related: ComfyUI: No module named 'yaml' (wrong Python) · ComfyUI: No module named 'ultralytics' · ComfyUI: No module named 'gguf' · ComfyUI: No module named 'torchaudio'

Written with AI assistance. Measured on 2026-10-24 on Linux, CPython 3.11.17: ComfyUI v0.37.0, torch 2.9.0+cpu, comfyui-various at commit ddf36c6, without and with soundfile 0.14.0. Output pasted unedited except shortened paths and a trimmed traceback. PlainTables is our extension; ComfyUI, comfyui-various and soundfile are free.