Breath of Fire 2 SPC hacking

I've never tried anything like this, but if I wanted it to happen I'd probably try this - setup Geiger's SPC debugger, then trigger a random encounter, with the old music. Then, go trip the variable to change the battle music. Then, attempt to get into the same random encounter with EVERYTHING else being the same, such as inventory, party members, hp, etc. then parse the two logs and try to "find the differences". If you're lucky, only a few bytes will be different, allowing you to laser in your focus on just a few possibilities.