After some challenges getting the app approved, the good ppl at Holderness Media were likely proud to have Waviary, their ambient generative instrument app approved and go live in the App Store.
Again, I can hear something pretty interesting happening right here and added to that, hard to beat a 99¢ price to for this. Sadly, this isn't a universal app, and has only been ported to the iPad. But there are some great iPad deals out right now, but that's on you.
Either way, enjoy.