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todbot/synthio_filter_test.py

Created June 6, 2023 00:40
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trying out new synthio filter PR, knobs control frequency and resonance, in CircuitPython
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synthio_filter_test.py
# synthio_filter_test.py -- trying out new filter PR, knobs control frequency and resonance
# 5 Jun 2023 - @todbot / Tod Kurt
import time, random, board, analogio, audiopwmio, synthio
audio = audiopwmio.PWMAudioOut(board.GP10)
synth = synthio.Synthesizer(sample_rate=22050)
audio.play(synth)
knob1 = analogio.AnalogIn(board.GP26)
knob2 = analogio.AnalogIn(board.GP27)
note1 = synthio.Note(frequency=110)
synth.press(note1)
while True:
lpf_f = 10 + knob1.value / 32
lpf_q = knob2.value / 20000
note1.filter = synth.low_pass_filter(lpf_f, lpf_q)
print(lpf_f, lpf_q)
time.sleep(0.1)
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