The creators at ZooZ Mobile describe ZooZBeat as a “gesture-based mobile music studio,” and in their demos they did indeed control tonality and volume by varying the intensity and direction of a waving or shaking motion.
But if you want more fine-tuned control, an on-screen editor (shown in the screenshot) lets you use your fingertip to make changes.
ZooZBeat is available in either a “Lite” version (99 cents for the Apple folks, free for the Nokias) or a full version ($2.99 all platforms) with support for voice recording, the ability to play with others, and more beat and instrument options.