so are you saying that this is impossible?
N- actually, with the way he described it, yes. However I recall one of the GOOD scripters on Roblox had a system that would be relatively easy to use here, keybinds. Basically, having the add-on installed allows you to set keybinds to play a note. We'd probably be able to have only basic chords, but it'd do. People without the add-on installed and keybinds set can just click to play a simple tune or single note.