Fun for a bit. Great tutorial. But it just didn't hold my attention. Maybe I'm not musical enough to appreciate this, but maybe a bit more "structure", somehow? Like you get points for discovering certain awesome combinations or something? Some sort of challenge? I feel bad for only giving you 3.5/5, since I actually think this is really neat and I'm looking forwards to the next one, but it just seems like it needs more to be complete.
Also, I kept getting the synchronization error message saying that my computer might be too slow - unlikely since I have a brand new i7.