From the App Store: TC-Orbiter is a MIDI motion controller with 53 controllers using the gyroscope, accelerometer, and compass. Send MIDI Pitch Bend and CC messages to any MIDI device.
TC-Orbiter has zero-configuration motion transmission to TC-11 or TC-Data on the iPad via Bluetooth. It lets you use your iPhone / iPod touch as a satellite motion controller.
TC-Orbiter adds motion control to your performance while your iPad stays still. You can also send patch changes remotely. Cycle through patches for another performer, or change patches without menu-diving while projecting a TC-11 / TC-Data performance.