This video, via Adam Somers, is a vintage (2004) example of analog video synthesis with an ARP 2600 synthesizer.
The ARP is being used as a signal generator to control an analog video synthesizer.
Here’s what Somers has to say about the technical details:
This video was created using the OEI analog video synthesizer, with control voltage inputs for various parameters. The control source used was an Arp 2600 synthesizer.
The audio produced by the synth is audible at a low volume.