Control Voicemeeter App Volume with Midi Slider

test-midiappfader.py

import logging

import voicemeeterlib

logging.basicConfig(level=logging.DEBUG)


class MidiObserver:
    """A simple observer to handle MIDI events."""

    def __init__(self, vm):
        self.vm = vm
        self.vm.observer.add(self.on_midi)

    def on_midi(self):
        """Callback for MIDI events."""

        current_input = self.vm.midi.current
        current_value = self.vm.midi.get(current_input)
        match current_input:
            case 0:  # corresponds to the leftmost MIDI fader (Korg NanoKontrol 2)
                self.vm.strip[5].appgain('Spotify', current_value / 127)


def main():
    KIND_ID = 'potato'

    with voicemeeterlib.api(KIND_ID, midi=True) as vm:
        MidiObserver(vm)

        while _ := input('Press <Enter> to exit\n'):
            pass


if __name__ == '__main__':
    main()