Random battle theme

So you are saying that each map (which I'm guessing there are maps for each themed area) have a way to change the battle theme for that one area only?   I have two questions about this method though.  Will it affect the battle background code already in place by the ASM hack, and also, can I figure out where these events are by only hex editing? After all, my 1.1 rom is corrupted and event editors will not allow me to save (consequences of basing my hack on General Leo edition).

Sorry I misread your first post. Yeah for a battle music different from one in the ASM hack, you'll need to add the same exception but by editing the ASK code I made. You'll need to check after the LDA table,x with a BEQ if it's the Magitek song ID, if so check if you are in the WoR with the WoR event bit if so set your WoR Magitek Facility song ID.

Ok, so this would open a HUGE can of worms for me in my music choices, but is there any way there can be two tables: one for the WOR, and one for the WOB with the same backgrounds? I would need someone to help me do this since I literally know nothing about ASM, but would this actually be difficult at all?