Showing content from https://todbot.github.io/CircuitPython_Synthio_Tutorial/6_audio_effects/code_demo.py below:
# 6_audio_effects/code_demo.py -- show off some audio effects # part of todbot circuitpython synthio tutorial # 20 Apr 2025 - @todbot / Tod Kurt # import time, audiofilters, audiodelays, audiocore, synthio from synth_setup import mixer, BUFFER_SIZE, CHANNEL_COUNT, SAMPLE_RATE cfg = { 'buffer_size': BUFFER_SIZE, 'channel_count': CHANNEL_COUNT, 'sample_rate': SAMPLE_RATE } effects = ( audiofilters.Filter(**cfg, mix=1.0, # mostly no filtering, pass-through filter = synthio.Biquad(synthio.FilterMode.LOW_PASS, frequency=20000, Q=0.8)), audiofilters.Filter(**cfg, mix=1.0, filter = synthio.Biquad(synthio.FilterMode.LOW_PASS, frequency=200, Q=1.2)), audiodelays.Chorus(**cfg, mix = 0.6, max_delay_ms = 150, voices = 3, delay_ms = synthio.LFO(rate=0.6, offset=10, scale=5)), audiodelays.Echo(**cfg, mix = 0.6, max_delay_ms = 330, delay_ms = 330, decay = 0.6), audiofilters.Distortion(**cfg, mix = 1.0, mode = audiofilters.DistortionMode.OVERDRIVE, soft_clip = True, pre_gain = 40, post_gain = -20), audiodelays.PitchShift(**cfg, mix=1.0, semitones = synthio.LFO(rate=2/3.5, scale=6)), ) mixer.voice[0].level = 1.0 #mywav = audiocore.WaveFile("amen1_44k_s16.wav") mywav = audiocore.WaveFile("amen3_44k_s16.wav") i = 0 while True: effect = effects[i] # pick a new effect print(i, effect) mixer.voice[0].play(effect) # plug effect into mixer effect.play(mywav, loop=True) # plug wavfile into effect time.sleep(3.5) # loop is 3.5/2 seconds long i = (i+1) % len(effects)
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