Showing content from https://todbot.github.io/CircuitPython_Synthio_Tutorial/4_oscillators_wavetables/code_wavewav.py below:
# 4_oscillators_wavetables/code_wavewav.py # part of todbot circuitpython synthio tutorial # 10 Feb 2025 - @todbot / Tod Kurt # import time import ulab.numpy as np import synthio from synth_setup import synth, knobA import adafruit_wave # reads in entire wave into RAM # return tuple of (memoryview on the WAV, sample_rate, num_samples) def read_waveform(filename): with adafruit_wave.open(filename) as w: if w.getsampwidth() != 2 or w.getnchannels() != 1: raise ValueError("unsupported format") return (memoryview(w.readframes(w.getnframes())).cast('h'), w.getframerate(), w.getnframes()) wave_wav, sample_rate, num_samples = read_waveform("/amen1_8k_s16.wav") duration = num_samples / sample_rate print("sample_rate:%d num_samples:%d duration:%.2f" % (sample_rate, num_samples, duration)) note = synthio.Note(frequency=1/duration, waveform=wave_wav) synth.press(note) while True: note.frequency = (1/duration) * (0.25 + (knobA.value / 65535) * 1.5) print("note freq:%6.3f duration:%5.2f" % (note.frequency, 1/note.frequency)) time.sleep(0.2)
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