I have a bit of a feature request. I'm not sure how easily it could be implemented, but it would be awesome to be able to record the input of the user so you could play back your music. If combined with a multi-instrument setup (like this is quickly turning into) it would be a great app to show off.

I was thinking Pyano would only have to record when the user hit each key, and on play back Pyano just references the sound files. Basically it would be like how you already have it set up for playing the sounds, just something different telling it when to play/load each sound file.