Well, I haven't done hacking work in a long time now, I still know my way around XSE better than most, but I never got the chance to get into music hacking.
All I can say is good luck with the tool, and I hope it turns out better than Sappy, lol.
I'm making a Ultima Music Editor!
~ No crashing~
~ Open non Pokemon roms( difficult) ~
~ edit the track's instrument using the built in tracks editor ~
~ Import and Export Tracks
~ Very useful information in there ~
Intresting right? I'm a GBA Music Editor