You seem to have found a significant weak spot: apart from the dubious approach of rejecting MIDI, ignoring OSC and reinventing the wheel, the assumption of oct

You seem to have found a significant weak spot: apart from the dubious approach of rejecting MIDI, ignoring OSC and reinventing the wheel, the assumption of octaves is very gratuitous and a net complication. MIDI supports 127 different notes and it is the synthesizer's job to decide their pitch; likewise, a piano roll has a predefined set of notes, each with its own pitch. It's therefore very unfortunate that they decide to be much less flexible than MIDI and represent notes as > The octave of the note, stored as an i8. For example, in 12-TET, a value of 0 means the octave with root note C4, 1 is the octave with root note C5, -1 is the octave with root note C3, etc. > The index of the note in the scale stored as a u16. For example, in 12-TET, a value of 0 means C, a value of 1 means C#, a value of 2 means D, etc. clearly closing the door to flat identifier spaces like the MIDI note number and to more general representations of tuning with non-octave repeating intervals or with the pitch of every note.