OD_A has created a video synthesizer that uses a Teensy 3.5 to oscillate frequencies into the RGB channels of a VGA signal.

The interface consists of individual sliders for each of the red, green, and blue channels, which are then “mixed” with a video input (in the style of a DJ mixer) to produce glitchy visuals akin to unusually beautiful VHS tracking skew. After some op-amp and other circuitry issues, OD_A was able to figure out a way to abuse the VGA spec to achieve the desired results, thanks to guidance from the PJRC forum community. See the results in the video below, and check out more of OD_A’s projects and hacks at os-is.me.