Example from Kickstarter video (1.32 to 1.45 mins), featuring Joshua Young (AUUG founder)
The harmony notes were controlled by the keys on Key Screen, and harmony volume was controlled by Up-Down or Left-Right motion. The vocal 'chop' effect was turned on or off via Forearm Rotation, and the rate of the effect was controlled by the direction of motion (different motion inputs, e.g. Left Motion, being used to control CC values on the same MIDI controller number).
A description of how to use the VoiceLive Touch with the Motion Synth is being created here.