Function pitchClassesToPianoChordNotes
(): Arrayexternal Array<Notetype NoteNote>
Returns an array of notes that represent a chord played on a piano in a certain octave.
· pitchClasses - undefined
· octave - Octave for the chord root.
· inversion - Whether to invert the chord. 0 - root position, 1 - 1st inversion, 2 - 2nd inversion,
etc...