Here’s a video preview:
Here’s what they have to say about TC-Performer:
Explore unreal synthesis with the most unique performance control on iOS! TC-Performer presents a multi-touch performance environment unlike any other synthesizer. Simply touch the screen; there are no buttons, keys, or sliders to hit. The sounds are generated entirely by your touch movements.
Each patch has a unique method of control. Pull, tap, drag, twist, and stretch your touches on the screen. There is no wrong way to play! Every instrument is a new landscape of sound creation. Pads, leads, effects, and indescribable oddities await.
You can download more patches in packs inside the app. There is also a transposition section available to change the key of the patch to fit your song, and Audiobus compatibility to record via inter-app audio.