PixelForm has been mentioned before on the GetLoFi with very cool modded TI-99s and Ataris. What is different about this V3 model in particular is the built in quad oscillators that can be feedback in to the video patches for creating dynamically changing patterns. However the audio does not seem to be linked to the video, so the circular content generation is not possible at this moment. I am really surprised that more people are not toying around with these computers for bending purposes, they are dirt cheap compared to this Pixel Maelstrom V3 from Bent 2006 modified version, which is up on eBay right now. There are also some videos of the device in action available on the auction page.