ComfyUI Signal Processing

This repo contains 4 nodes for ComfyUI that allows for audio filtering

Nodes

SignalProcessingPaulStretch :

This node lets you stretch audio to about 100x it's original speed whil mainting pitch. it's great for making pad sounds. It's a port of fantastic algorithm of by by Nasca Octavian PAUL, his repository here : https://github.com/paulnasca/paulstretch_python

audio: input audio
stretch_factor: the stretch factor from 0 to 100
window_size_seconds: window length ins seconds. higher value create smoother stretching effect.

SignalProcessingPadSynth :

This node is a synthesiser "PadSynth" based on an algorithm by Nasca Octavian PAUL Original Source Code Here: https://zynaddsubfx.sourceforge.io/doc/PADsynth/PADsynth.htm

samplerate: samplerate
fundamental_freq: fundamental frequency for the sounds generation
bandwidth_cents: bandwidth centers
number_harmonics: number of harmonics
amplitude_per_harmonic: amplitude per harmonic as a json, takes as list of amplitudes [0,1,4,...], it's count must match number of harmonics

SignalProcessingFilter :

This node lets you stretch audio to about 100x it's original speed whil mainting pitch. it's great for making pad sounds:

audio: input audio
cutoff: filter cutoff
filter_type: filter type - "lowpass", "highpass", "bandpass", "bandstop"
q_factor: weidth of the filter

SignalProcessingLoadAudio :

This node lets you stretch audio to about 100x it's original speed whil mainting pitch. it's great for making pad sounds:

audio_file: input audio file
seek_seconds: when to start audio from