Excerpt from Wired News: Developed by James Patten and Ben Recht, the Audiopad is projected on a special table equipped with radio sensors that track the position and movement of half a dozen plastic discs, or "pucks." Most of the pucks control a series of preprogrammed tracks -- the rhythm, the bass line, the melody and other samples. http://www.wired.com/news/mediaplayer/0,2108,59779-59779-audio_pad1_qt_hi,00.html