Just to be clear: Game 4 on that Cart is auto-generating stuff on the screen and the "game-part" of it is that you can do real-time modifications to it. When you like what was done, you can switch to Game 3, which is "Free Painting" where you can modify the generated image pixel by pixel if you want until you're happy with the outcome.

i'd guess it's probably quite tricky to capture channel f output directly? it probably only has RF out which you probably can't do much with unless you give it some kinda composite mod

yep. see: http://channelf.se/veswiki/index.php?title=Modding
also: https://atariage.com/forums/topic/274416-the-official-channel-f-thread/?do=findComment&comment=4846288

this is oddly hypnotizing... (monotone voice) I will wire all my savings over to amy kleeder.