Custom instruments

So, I believe it would be pretty cool if Noteflight had a way to make custom instruments. By custom instruments, I mean noteflight could have a menu area where you could pick which sounds come from which note. For example, I could have one instrument that could play trombone notes for some notes, and piano notes for some notes, and viola for the rest. We could set what pitches we want, or what percussion instruments to put on it. Even custom drum set layouts would be cool! If this ever does become a thing, it should be for all accounts, but if it’s only for premium accounts, that could be cool too. I forgot- the instruments would be saved to the creator’s account and their account only, to use on whatever scores they wish to use it on.