I think http://www.jammed.com/~jwa/tempest.html might be the same FAQ/info page (right author, anyway), although last updated in '99, and no obvious links to any code (except one link about sniffing CPU emissions, which is also bitrotted)
He has guitar leads on his hands, and preset loops playing on each tv - for example, drum samples, tones - recorded on VHS. The audio is recorded as the video signal. Then, by putting his hands near the front of a television, the video signal is picked up by the guitar lead and played through the amplifier. He can play it by selecting which sample to play when.
