Stupid and Crippled
Its like a real keyboard, but only if you have one single, really akward finger. Make it so you can use the actual computer keyboard to play, and you'll have a perfect musical keyboard, that almost completly recreates a real one. You've got the whole thing built, and it couldn't be that hard to do, but it will make the whole thing infinatly better. I'd give this a 4, but with keyboard input, probably a 10.