@Reiddragon I thought the EE was clocked up 5MHz (294->299) to accommodate for the missing hardware, no?

As for BC on GBA, I just happen to have a GBC game (Wings of Fury) that plays differently on the GBA. The music has hanging notes, which the GBA cuts short. An example can be seen after the player is downed with no lives left, and Last Post starts playing.

@SuperDicq @rher