I am just finished programming Yoyo, one of the many machines of http://AmorphicRobotWorks.org/ . Yoyo listens to rhythms created by gallery goers and improvises upon them using his three fingers on a drum, a bass kick, and a bow on a long berimbau-like string. Yoyo is at the Art Interactive gallery in Cambridge, Massachussets until October 6th, as part of the "Engaging Characters" show:

http://artinteractive.org/

Yoyo is controlled by a Pd patch running on a Debian GNU/Linux PC. MIDI signals are sent to one of Eric Singer's MIDI relay boards, which control a set of Opto-22 relays, which control motors and pneumatic pistons. All of the software will be released under the GNU GPL. An ogg stream is planned.

.hc