Skip to content
Apply audio effects such as reverb and EQ directly to audio files or NumPy ndarrays.
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
pysndfx Pull-request: Add doc strings to most effects that lacked them. (#21) Dec 4, 2018
setup.cfg Enforce code consistency Nov 20, 2018


Build Status PyPI PyPI license

Apply audio effects such as reverb and EQ directly to audio files or NumPy ndarrays.

This is a lightweight Python wrapper for SoX - Sound eXchange. Supported effects range from EQ and compression to phasers, reverb and pitch shifters.



pip install pysndfx

The system must also have SoX installed.

For Debian-based operating systems: apt install sox

For Anaconda: conda install -c conda-forge sox


First create an audio effects chain.

# Import the package and create an audio effects chain function.
from pysndfx import AudioEffectsChain

fx = (

Then we can call the effects chain object with paths to audio files, or directly with NumPy ndarrays.

infile = 'my_audio_file.wav'
outfile = 'my_processed_audio_file.ogg'

# Apply phaser and reverb directly to an audio file.
fx(infile, outfile)

# Or, apply the effects directly to a ndarray.
from librosa import load
y, sr = load(infile, sr=None)
y = fx(y)

# Apply the effects and return the results as a ndarray.
y = fx(infile)

# Apply the effects to a ndarray but store the resulting audio to disk.
fx(x, outfile)

There's also experimental streaming support. Try applying reverb to a microphone input and listening to the results live like this:

python -c "from pysndfx import AudioEffectsChain; AudioEffectsChain().reverb()(None, None)"
You can’t perform that action at this time.