Don't know if this interests anyone, it's only 0.69p or $1 on the apps store at the moment, rises to $30 after launch week.
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The Animoog takes the familiar, spaced-out sound profile Moog is famous for and warps it, using the iPad’s multi-touch interface and some very cool animated visualizations to create a unique instrument. It’s simple enough for anyone to play, but also deep enough to encourage extended experimentation. On top of that accomplishment, the Animoog is just about the trippiest sound-thing available for the iPad.
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more info here
www.wired.com/reviews/2011/10/animoog/