Well, this *IS* the original, as in only, patch. And I don't know why I even thought of throwing in other things into a "music-only" patch. If I make a separate one, I'll do just that, so ignore question 2 everyone.
When you say "revert," do you mean change back to the GBA tracks EVER, or revert to them after saving the game and turning it off/on? You know you can always turn off the GB Player if it is on.
The next patch will (hopefully) be out within a few days, and it will indeed add the GB Player as a key item. It's fully functional, I'm just trying to figure out what's going on with a particularly annoying bug that's related to it.