If you still interest, I buy ipianoroll, and it sucks ... It just doesn't work, and the MIDI's (maybe the most important feature) neither work. Hope you don't spend money on that useless app, and if you find a good synthesia app you share it =).

Is there a way to use my ipad as the keyboard in synthesia? I downloaded virtuoso and I have my ipad connected to my computer but its not showing up as a keyboard. Is it possible?

Seems unlikely, but I would not know for sure.

I hesitate to dredge up such an old thread, but for anyone that is still interested, Synthesia for iPad is now available in the App Store.

(Disclosure: I'm the guy that makes Synthesia.)