I've given up with the ROM hack. It kept crashing, and I sucked at scripting.
BUT; I am still working on a RMXP game. Which requires .mp3's for music.
Can I still use the music for it? <3
If it's okay with you, I would rather insert it. Though only because I edited the voicegroup a lot. And I mean a lot. So it would be easier if I could just copy the instrument properties from my ROM to the hack.