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Content import display, keypad import sndmixer vol = 255#machine.nvs_getint('system', 'volume') or 15 on = 0xFF00FF off = 0x000000 sndmixer.begin(16) channels = [None] * 16 def on_key(key_index, pressed): x, y = key_index % 4, int(key_index / 4) if pressed: frequency = int(440 * (2**(key_index/12))) synth = sndmixer.synth() channels[key_index] = synth sndmixer.volume(synth, vol) sndmixer.waveform(synth, 0) sndmixer.freq(synth, frequency) sndmixer.play(synth) display.drawPixel(x, y, on) display.flush() else: if channels[key_index] is not None: sndmixer.stop(channels[key_index]) display.drawPixel(x, y, 0x00) display.flush() keypad.add_handler(on_key)