Hey, thanks for letting me know about this problem! :) I'm glad you enjoyed the game! I think programming electronic drums really makes you want to play the real thing, that's what happened to me too~
I thought I'd fixed that problem you mentioned before releasing the update, it's a pretty bad problem, it basically means the beatmaker is unusable. It should be pretty easy to solve though. I'll try to do the fix and upload it tonight when I get home.