get octaveOffset() {
    return this._octaveOffset;
  }
An integer to offset the reported octave of incoming notes. By default, middle C (MIDI note
number 60) is placed on the 4th octave (C4).

If, for example, `octaveOffset` is set to 2, MIDI note number 60 will be reported as C6. If
`octaveOffset` is set to -1, MIDI note number 60 will be reported as C3.

Note that this value is combined with the global offset value defined in the
[`WebMidi.octaveOffset`](WebMidi#octaveOffset) property (if any).

@type {number}

@since 3.0