destroy() {
    this._input = null;
    this._number = null;
    this._octaveOffset = 0;
    this._nrpnBuffer = [];
    this.notesState = new Array(128).fill(false);
    this.parameterNumberEventsEnabled = false;
    this.removeListener();
  }
Destroys the `InputChannel` by removing all listeners and severing the link with the MIDI
subsystem's input.