I'm putting the NoteOn project on pause for a bit. Developing NoteOn's firmware has been more tedious than I expected, and I've lost interest in the project as a result. I'll probably start working on NoteOn again 6-12 months from now. In the meantime, feel free to use or adapt it however you like. The design files are licensed CCv4-BY-SA and are available here. The firmware is licensed GNU GPLv3 and is available on GitHub.
I won't be proceeding further in the HaD Prize. Thanks to Hackaday and Supply Frame for putting it on, and good luck to everyone still in the running.