Audio/video synthesizer with hacked VGA cables.
By James H. Connolly
http://jameshconnolly.com/rgb-vga-volt
A better tutorial (with warnings) on building the cables, at CrackedRayTube, also by James Connolly with Kyle Evans: http://crackedraytube.com/pdfs/hacking_a_vga_monitor.pdf
Max patch for controlling the system: http://jameshconnolly.com/rgbvgavolt/RGB.VGA.VOLT.zip