Mega Man X3 - Gravity Beetle Music Hack
I've actually learned a lot about how X3's music is programmed, at least in terms of how the note data works, and I've also learned the values that control which instrument plays, and which scale or even octave is used.
For this, I used the re-tuned brass from my previous video, and I replaced the overdriven guitar sample from one of the rhythm tracks with the distorted guitar sample (which seems to be the original intention, since those two tracks notes are in harmony), and I replaced the backing brass section later in the track (I think you'd call it a climax?) with the overdriven guitar, and retouched both to make sure they were in in sync, so the harmony would work better. I also replaced the short octave sections near the end with harmonies, though that was mostly to save space (I'm still tweaking it, so I might reinsert those octave parts).
I'm sorry if my descriptions aren't the best. I'm not too well versed in music terminology. At least, this is all programmed in the game, and fully functional, which is the first time I've done something like this.