Geo Synthesizer
An iOS app which is a musical instrument and MIDI controller
Screenshots
Hunter's comment
Its an app which is actually a music instrument through which you can play different tunes and also it works as a MIDI controller.
Geo Synthesizer is an incredibly expressive musical instrument specifically created for a multitouch surface.
Source
Link
http://www.wizdommusic.com/products/geo_synthesizer.html
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