It's not going to turn you into the next McCoy Tyner, but a new iPhone app could help you get in a few practice licks. iAno uses the phone's touchscreen for a virtual piano keyboard
The current version is polyphonic to the extent of being able to play five tones at once and divides a truncated keyboard into scrollable sections. An 88-key version is on the way, says developer "Mr. Aardvark." Sampling quality sounds better than the hideous junior college Clavinovas I'm trying to learn on.
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iphone + piano = iano [Technablob]