I can't help you with much about hacking Golden Sun, mainly because I don't understand its compression format and what all the data means. So, you'll have to wait for Atrius to come back for the third release, and that will be a few months.
Enjoy the editor for now, though.
I could also help you with music hacking the rom as well.
Also, when you type in all caps, it's considered a little rude. I'm not mad or anything, but you could really set someone off.