My only major gripe (as someone who does play an instrument) is that the way the system is designed utilizing skills in this manner... You can't play chords. Single note is fine and all for simple pieces, but the only way to make chords with the system is to record a song multiple times utilizing each note in the chord at its position in the composition (with millisecond precision if you want it to be seamless) and then layer those tracks together in a video/sound editor.

It's not a system breaking thing and you can still make music with it, it's just a little disappointing. I understand the technical issues involved, but I'd still love to have some chords available to me.