first commit computer perfection synth code
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John Park
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Computer_Perfection_Synth/code.py
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Computer_Perfection_Synth/code.py
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# SPDX-FileCopyrightText: 2023 John Park, Jeff Epler, and Tod Kurt for Adafruit Industries
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# SPDX-License-Identifier: MIT
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# Computer Perfection Synth
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# * 10 numbered buttons play notes
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# * SET button to increase LFO rate, long press to decrease LFO rate
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# * SCORE button to add lower octave
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# * MODE switch changes LFO depth?
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# * SKILL switch toggles sustain
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# * GAME switch must stay in position 1 or it messes with the other switches
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import time
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import random
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import board
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import audiobusio
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import audiomixer
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import synthio
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import ulab.numpy as np
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import neopixel
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import keypad
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# NeoPixel setup
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num_pixels = 34
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pixels = neopixel.NeoPixel(board.D11, num_pixels, brightness=0.7, auto_write=False)
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pixels.fill(0x0)
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pixels.show()
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time.sleep(0.25)
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pix_map = [26, 23, 19, 16, 13, 10, 7, 4, 32, 29] # map the LEDs to the numbered panel sections 0-9
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for p in range(len(pix_map)):
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pixels[pix_map[p]] = 0xff0000
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pixels.show()
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time.sleep(0.1)
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note_buttons = keypad.Keys(
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(board.D0, board.D1, board.D2, board.D3, board.D4,
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board.D5, board.D6, board.D7, board.D8, board.A5),
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value_when_pressed=False,
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pull=True
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)
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switches = keypad.Keys(
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(board.A1, board.A0),
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value_when_pressed=False,
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pull=True
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)
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octave = 3 # octave multiplier
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note_list = (0, 4, 6, 7, 9, 12, 16, 18, 19, 21) # Lydian scale
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mod_buttons = keypad.Keys(
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(board.A4, board.A3), # SET and SCORE buttons
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value_when_pressed=False,
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pull=True
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)
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SAMPLE_RATE = 48000 # clicks @ 36kHz & 48kHz on rp2040
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SAMPLE_SIZE = 200
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VOLUME = 12000
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# Metro M7 pins for the I2S amp:
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lck_pin, bck_pin, dat_pin = board.D9, board.D10, board.D12
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# synth engine setup
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waveform = np.zeros(SAMPLE_SIZE, dtype=np.int16) # intially all zeros (silence)
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amp_env = synthio.Envelope( # default (0.1, 0.05, 0.2, 1, 0.8)
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attack_time=1.0,
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decay_time=0.05,
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release_time=3.0,
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attack_level=1.0,
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sustain_level=0.8
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)
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synth = synthio.Synthesizer(sample_rate=SAMPLE_RATE, waveform=waveform, envelope=amp_env)
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audio = audiobusio.I2SOut(bit_clock=bck_pin, word_select=lck_pin, data=dat_pin)
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mixer = audiomixer.Mixer(voice_count=1, sample_rate=SAMPLE_RATE, channel_count=1,
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bits_per_sample=16, samples_signed=True, buffer_size=8192)
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audio.play(mixer)
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mixer.voice[0].level = 0.55
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mixer.voice[0].play(synth)
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led = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.3) # on board neopixel
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# waveforms setup
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wave_sine = np.array(np.sin(np.linspace(0, 2*np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME,
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dtype=np.int16)
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wave_saw = np.linspace(VOLUME, -VOLUME, num=SAMPLE_SIZE, dtype=np.int16)
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wave_weird1 = np.array((198,2776,5441,8031,10454,12653,14609,16333,17824,19130,20260,21227,22043,
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22721,23269,23699,24019,24243,24385,24461,18630,-26956,-28048,-29175,-30249,
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-31227,-32073,-32631,-32359,-31817,-30941,-29663,-27900,-25596,-22591,
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-18834,-14291,-9016,-3212,2794,8624,13943,18544,22353,25408,27780,29553,
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30855,31751,32315,32611,32687,32593,32351,31983,31491,30871,30097,28895,
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-28240,-30489,-31343,-31975,-32431,-32697,-32767,-32615,-32217,-31525,
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-30489,-29035,-27090,-24519,-21237,-17178,-12339,-6829,-902,5081,10748,
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15805,20102,23615,26396,28510,30109,31245,31995,31955,31437,30729,29887,
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28943,27908,26784,25560,24077,22781,-22207,-22735,-22709,-22471,-22065,
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-21497,-20773,-19896,-18872,-17698,-16361,-14857,-13141,-11206,-9054,-6717,
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-4259,-1796,522,2548,4167,5339,6079,6445,6503,6319,5949,5449,4847,4183,
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3480,2756,2028,1304,590,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-478,-1168,-1882,-2596,
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-3336,-4074,-4795,-5487,-6119,-6669,-7095,-7357,-7399,-7157,-6559,-5543,
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-4076,-2132,), dtype=np.int16)
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wave_noise = np.array([random.randint(-VOLUME, VOLUME) for i in range(SAMPLE_SIZE)], dtype=np.int16)
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# map s range a1-a2 to b1-b2
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def map_range(s, a1, a2, b1, b2):
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return b1 + ((s - a1) * (b2 - b1) / (a2 - a1))
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# mix between values a and b, works with numpy arrays too, t ranges 0-1
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def lerp(a, b, t):
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return (1-t)*a + t*b
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waveform[:] = wave_saw
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wave_mix = 0.0
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lfo_rates = (0.1, 0.5, 0.8, 1.5, 3.0, 6.0, 7.0, 8.0)
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lfo_index = 0
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lfo1 = synthio.LFO(rate=(lfo_rates[lfo_index]), waveform=wave_sine) # rate is in Hz
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synth.lfos.append(lfo1)
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hold = False # state of note hold
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octaves = False
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def light_button_pixels(button_number):
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pixels[pix_map[button_number]+1] = 0xFF0000
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pixels[pix_map[button_number]-1] = 0xFF0000
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pixels.show()
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def reset_button_pixels(button_number):
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pixels[pix_map[button_number]+1] = 0x000000
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pixels[pix_map[button_number]-1] = 0x000000
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pixels.show()
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def clamp(v, low, high):
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return min(max(v, low), high)
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print("-Computer Perfection Synth-")
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note = None
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mod_key = 0
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last_mod_button_event_time = 0
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waveset = 0
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while True:
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# watch for mod buttons to be pressed
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mod_button_event = mod_buttons.events.get()
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if mod_button_event:
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mod_key = mod_button_event.key_number
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if mod_button_event.pressed:
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if mod_key == 0: # SET switch
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last_mod_button_event_time = time.monotonic()
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if mod_key == 1: # enable octaves
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octaves = True
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if mod_button_event.released:
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if last_mod_button_event_time and mod_key == 0: # short press-release increase LFO rate
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lfo_index = clamp(lfo_index+1, 0, len(lfo_rates)-1)
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print(lfo_index)
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lfo_rate = lfo_rates[lfo_index]
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lfo1.rate = lfo_rate
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last_mod_button_event_time = 0
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if mod_key == 1: # disable octaves
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octaves = False
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# long press slows the LFO rate
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if last_mod_button_event_time != 0 and time.monotonic() - last_mod_button_event_time > 1.0:
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last_mod_button_event_time = 0
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lfo_index = clamp(lfo_index-1, 0, len(lfo_rates)-1)
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lfo_rate = lfo_rates[lfo_index]
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lfo1.rate = lfo_rate
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# watch for note buttons to be pressed
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note_button_event = note_buttons.events.get()
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if note_button_event:
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i = note_button_event.key_number
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if note_button_event.pressed:
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if octaves:
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synth.press((note_list[i]+(octave*12), note_list[i]+(octave*12)-12))
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else:
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synth.press((note_list[i]+(octave*12),))
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light_button_pixels(i)
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if note_button_event.released:
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if not hold:
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reset_button_pixels(i)
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synth.release((note_list[i]+(octave*12), note_list[i]+(octave*12)-12))
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reset_button_pixels(i)
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# watch for switches to be changed
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switch_event = switches.events.get()
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if switch_event:
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sw = switch_event.key_number
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if switch_event.pressed:
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if sw == 0: # MODE toggle right
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mixer.voice[0].level = 0.45
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# wave_mix = 0.5
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waveset = 0
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if sw == 1: # SKILL toggle center
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hold = True
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if switch_event.released:
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if sw == 0: # MODE toggle center
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mixer.voice[0].level = 0.95
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waveset = 1
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if sw == 1: # SKILL toggle right or left
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hold = False
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for r in range(len(note_list)): # turn off all notes
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# if octaves:
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synth.release((note_list[r]+(octave*12), note_list[r]+(octave*12)-12))
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for h in range(len(pix_map)): # turn off held pixels
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reset_button_pixels(h)
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lfo_val_for_lerp = map_range(lfo1.value, -1, 1, 0, 1)
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if waveset == 0:
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waveform[:] = lerp(wave_sine, wave_weird1, lfo_val_for_lerp)
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else:
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waveform[:] = lerp(wave_saw, wave_noise, lfo_val_for_lerp)
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