The most mature iOS control surface
TouchOSC may not be as flashy as Konkreet Performer but its arguably more useful and has more features. The layout editor runs great and transferring new layouts to the iPad from the editor is a breeze. Setting TouchOSC up to work with Reaktor running on my Mac was quick and painless. Even creating new layouts from scratch was fast and intuitive. If youre using programs that support OSC then buying this is a no brainer.
Keep in mind that the iPhone scale layouts wont load on iPad and vice versa.
the magic hat about
TouchOSC Mk1, v1.6.4