audio synthesizer

It looks like analog video synthesis is starting to see the surge in experimentation that the Internet has brought to audio synthesis.

This is a preview of a Sergio Martinez’s DIY FPGA-based video synthesizer. Martinez connected the FPGA to an old computer monitor, and then recorded the images with a cheap webcam. The coloured dots are the  phosphor sub-pixels of the monitor.

Anybody know of combination audio/video synths? It would be interesting to see how you could combine the two to have the audio synth modulating the video.