This kind of pack is just what the GBS community needs. Fairly priced and versatile.
One thing to consider it that scenes with heavy usage of sounds effects will require channel 2 to be free of information so that SFX do not conflict with the music. Makes it significantly harder to create complex tunes but I think a less complex song that doesn't conflict with SFX is better than the alternative - or at least a track with very light usage of channel 2 to minimize timing conflicts. Doesn't need to be every song in a pack, certainly. I made a copy of bs-mm-theme.uge and removed channel 2 and its still a banger, for example.
Well done, bud.