i was messing with this and found that if you save a beat with a tempo say for example 90 bpm and then turn off the gameboy and reload the save, the tempo is screwed up. i found right after you load the save you have to click on the bpm in order for the speed to be correct.
also it does not remember the screen set up.
Other then those bugs its a fun program and sounds really nice playing out of the GBA.
If there is a way to load your own samples into it then it would take it to a whole new level!