43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
|
|
#
|
|
# SPDX-License-Identifier: MIT
|
|
|
|
import time
|
|
import board
|
|
import digitalio
|
|
import audiomixer
|
|
import synthio
|
|
|
|
# for PWM audio with an RC filter
|
|
# import audiopwmio
|
|
# audio = audiopwmio.PWMAudioOut(board.GP10)
|
|
|
|
# for I2S audio with external I2S DAC board
|
|
import audiobusio
|
|
|
|
# I2S on Audio BFF or Amp BFF on QT Py:
|
|
# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
|
|
|
|
# I2S audio on PropMaker Feather RP2040
|
|
power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
|
|
power.switch_to_output(value=True)
|
|
audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
|
|
|
|
mixer = audiomixer.Mixer(channel_count=1, sample_rate=44100, buffer_size=4096)
|
|
synth = synthio.Synthesizer(channel_count=1, sample_rate=44100)
|
|
|
|
audio.play(mixer)
|
|
mixer.voice[0].play(synth)
|
|
mixer.voice[0].level = 0.2
|
|
|
|
lfo_tremolo = synthio.LFO(rate=0.8, scale=0.3, offset=0.7)
|
|
|
|
midi_note = 50
|
|
note1 = synthio.Note(synthio.midi_to_hz(midi_note), amplitude=lfo_tremolo)
|
|
|
|
synth.press(note1)
|
|
|
|
|
|
while True:
|
|
print(lfo_tremolo.value)
|
|
time.sleep(0.05)
|