Showing content from https://todbot.github.io/CircuitPython_Synthio_Tutorial/2_modulation/code_drum_tom.py below:
# 2_modulation/code_drum_tom.py import time, random import synthio import ulab.numpy as np from synth_setup import synth, knobA VOLUME=32767 NUM_SAMPLES=256 # drums are sine waves mostly wave_sine = np.array(np.sin(np.linspace(0, 2*np.pi, NUM_SAMPLES, endpoint=False)) * VOLUME, dtype=np.int16) # snare drums have a little noise at the begining wave_noise = np.array([random.randint(-VOLUME, VOLUME) for i in range(NUM_SAMPLES)], dtype=np.int16) # used to make the downward pitch bend ramp_down = np.array((32767,0), dtype=np.int16) # a little drum sequence: (note, time) notes = [(40, 0.25), # artitrary pitches that sound like high,mid,low toms (36, 0.25), (32, 0.25), (24, 0.5), # 24 is lowest, so let's say it's "bass" drum (24, 0.5), (34, 0.25), # 34 chosen arbitrarily to mean "snare" (24, 0.25), (34, 0.50)] ni=0 while True: n,t = notes[ni] # sequence step (note, time), used in release_time below tenv = t + ((knobA.value/65535)-0.1) print("%d note:%d time:%.2f tenv:%.2f" %(ni,n,t,tenv)) ni = (ni+1) % len(notes) # set up next note in sequence for next time ramp_down_lfo = synthio.LFO(rate=1/tenv, once=True, waveform=ramp_down) drum_env = synthio.Envelope(attack_time=0, release_time=tenv, decay_time=0) drum_env2 = synthio.Envelope(attack_time=0, release_time=tenv/2, decay_time=0, attack_level=0.1,) note = synthio.Note(synthio.midi_to_hz(n), envelope=drum_env, waveform=wave_sine, bend=ramp_down_lfo, ) # second note "beefs" up the low end of the drum or adds "snare" if note==34 note2 = synthio.Note(synthio.midi_to_hz(n/4), envelope=drum_env2, waveform=wave_noise if n==34 else wave_sine) synth.press(note) synth.press(note2) time.sleep(0) synth.release(note) synth.release(note2) time.sleep(t) # this determines our sequence speed
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