Audio d-touch is a set of 3 tangible interface applications for music composition and performance: the Augmented Stave, the Tangible Drum Machine and the Physical Sequencer. "

Audio d-touch" uses a consumer-grade web camera and customizable block objects to provide an interactive tangible interface for a variety of time based musical tasks such as sequencing, drum editing and collaborative composition. Three instruments are presented here. Future applications of the interface are also considered.

A paper about it here(.pdf)