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Merge pull request #2629 from jedgarpark/synthio-fundamentals
synthio fundamentals example code and wave files
2 parents c6ddbde + 8732b70 commit a980f68

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‎Synthio_Fundamentals/example_01_single_note.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import time
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import board
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import digitalio
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import synthio
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# for PWM audio with an RC filter
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# import audiopwmio
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# audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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synth = synthio.Synthesizer(sample_rate=44100)
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audio.play(synth)
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while True:
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synth.press(65) # midi note 65 = F4
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time.sleep(0.5)
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synth.release(65) # release the note we pressed
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time.sleep(2)

‎Synthio_Fundamentals/example_02_chord.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import time
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import board
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import digitalio
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import synthio
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# for PWM audio with an RC filter
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# import audiopwmio
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# audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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synth = synthio.Synthesizer(sample_rate=44100)
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audio.play(synth)
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while True:
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synth.press((65, 69, 72)) # midi note 65 = F4
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time.sleep(1)
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synth.release((65, 69, 72)) # release the note we pressed
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time.sleep(2)

‎Synthio_Fundamentals/example_03_chord_mixer.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import time
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import board
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import digitalio
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import audiomixer
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import synthio
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# for PWM audio with an RC filter
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# import audiopwmio
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# audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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mixer = audiomixer.Mixer(channel_count=1, sample_rate=22050, buffer_size=2048)
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synth = synthio.Synthesizer(channel_count=1, sample_rate=22050)
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audio.play(mixer)
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mixer.voice[0].play(synth)
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mixer.voice[0].level = 0.4
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while True:
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synth.press((65, 69, 72)) # midi note 65 = F4
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time.sleep(0.5)
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synth.release((65, 69, 72)) # release the note we pressed
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time.sleep(0.5)
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mixer.voice[0].level = (mixer.voice[0].level - 0.1) % 0.4 # reduce volume each pass

‎Synthio_Fundamentals/example_04_envelope.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import time
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import board
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import digitalio
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import audiomixer
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import synthio
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# for PWM audio with an RC filter
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#import audiopwmio
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#audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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mixer = audiomixer.Mixer(channel_count=1, sample_rate=22050, buffer_size=2048)
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amp_env_slow = synthio.Envelope(
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attack_time=0.2,
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sustain_level=1.0,
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release_time=0.8
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)
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amp_env_fast = synthio.Envelope(
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attack_time=0.1,
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sustain_level=0.5,
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release_time=0.2
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)
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synth = synthio.Synthesizer(channel_count=1, sample_rate=22050, envelope=amp_env_slow)
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audio.play(mixer)
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mixer.voice[0].play(synth)
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mixer.voice[0].level = 0.2
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while True:
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synth.envelope = amp_env_slow
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synth.press(46)
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time.sleep(1.25)
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synth.release(46)
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time.sleep(1.25)
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synth.envelope = amp_env_fast
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synth.press(51)
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time.sleep(1.25)
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synth.release(51)
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time.sleep(1.25)

‎Synthio_Fundamentals/example_05_filters.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import time
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import board
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import digitalio
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import audiomixer
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import synthio
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# for PWM audio with an RC filter
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# import audiopwmio
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# audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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mixer = audiomixer.Mixer(channel_count=1, sample_rate=22050, buffer_size=2048)
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amp_env_slow = synthio.Envelope(
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attack_time=0.2,
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sustain_level=1.0,
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release_time=0.8
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)
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synth = synthio.Synthesizer(channel_count=1, sample_rate=22050, envelope=amp_env_slow)
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# set up filters
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frequency = 2000
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resonance = 1.5
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lpf = synth.low_pass_filter(frequency, resonance)
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hpf = synth.high_pass_filter(frequency, resonance)
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bpf = synth.band_pass_filter(frequency, resonance)
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note1 = synthio.Note(frequency=330, filter=None)
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audio.play(mixer)
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mixer.voice[0].play(synth)
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mixer.voice[0].level = 0.2
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while True:
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# no filter
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note1.filter = None
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synth.press(note1)
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time.sleep(1.25)
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synth.release(note1)
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time.sleep(1.25)
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# lpf
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note1.filter = lpf
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synth.press(note1)
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time.sleep(1.25)
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synth.release(note1)
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time.sleep(1.25)
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# hpf
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note1.filter = hpf
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synth.press(note1)
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time.sleep(1.25)
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synth.release(note1)
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time.sleep(1.25)
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# bpf
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note1.filter = bpf
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synth.press(note1)
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time.sleep(1.25)
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synth.release(note1)
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time.sleep(1.25)

‎Synthio_Fundamentals/example_06_MIDI_input.py

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# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
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#
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# SPDX-License-Identifier: MIT
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import board
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import digitalio
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import audiomixer
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import synthio
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import usb_midi
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import adafruit_midi
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from adafruit_midi.note_on import NoteOn
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from adafruit_midi.note_off import NoteOff
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# note for ESP32-S2 boards, due to not enough available endpoints,
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# to enable USB MIDI, create a "boot.py" with following in it, then power cycle board:
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# import usb_hid
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# import usb_midi
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# usb_hid.disable()
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# usb_midi.enable()
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# print("enabled USB MIDI, disabled USB HID")
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# for PWM audio with an RC filter
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# import audiopwmio
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# audio = audiopwmio.PWMAudioOut(board.GP10)
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# for I2S audio with external I2S DAC board
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import audiobusio
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# I2S on Audio BFF or Amp BFF on QT Py:
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# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)
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# I2S audio on PropMaker Feather RP2040
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power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
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power.switch_to_output(value=True)
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audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
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mixer = audiomixer.Mixer(channel_count=1, sample_rate=22050, buffer_size=2048)
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midi = adafruit_midi.MIDI(midi_in=usb_midi.ports[0], in_channel=0)
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amp_env_med = synthio.Envelope(
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attack_time=0.05,
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sustain_level=0.8,
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release_time=0.2
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)
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synth = synthio.Synthesizer(channel_count=1, sample_rate=22050, envelope=amp_env_med)
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note1 = synthio.Note(frequency=330, filter=None)
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audio.play(mixer)
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mixer.voice[0].play(synth)
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mixer.voice[0].level = 0.2
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while True:
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msg = midi.receive()
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if isinstance(msg, NoteOn) and msg.velocity != 0:
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print("noteOn: ", msg.note, "vel:", msg.velocity)
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note1.frequency = synthio.midi_to_hz(msg.note)
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synth.press(note1)
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elif isinstance(msg, NoteOff) or isinstance(msg, NoteOn) and msg.velocity == 0:
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print("noteOff:", msg.note, "vel:", msg.velocity)
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note1.frequency = synthio.midi_to_hz(msg.note)
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synth.release(note1)

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