I was wondering how musicians and creators of Fire emblem hacks and GBA hacks in general found and used GBA instruments in the musical compositions. I have been writing music using the electric piano at my house, and am confident in my musical ability, but I do not know how to write it using GBA instruments. I am not asking anyone to write music for me, but I would appreciate it if somebody helped explain the basics of writing music for a FE hack, and would appreciate it if they helped me figure out how to import it into a game as well.