When adding a new key for note input it starts off with note value 0 but whenever you increment it with the +/- buttons or type a new number in it immediately moves elsewhere in the list to preserve the increasing order of the note numbers. This is confusing and led me to accidentally increment the note assignment of a load of different keys because a new one would appear under my mouse every time I clicked the + button.

I would suggest that the note input key assignment rows stay put while being edited, letting them go to their proper order after the settings window is closed.