This synth is being sold on Ebay as a charity auction:

Hi Friends, I procrastinated over the project for a long time. I just didn't want to gather up all my half-alive bits and combine them into a mess of damaged goods, wooden boards and overly complicated wires. But it ended up extremely rewarding! This frankensynth consists of:

Sound generator: Korg Kaossilator Pro with no touch screen
Controller: Behringer TD-1 analog synth which I thought would be able to mix its sound with the Kaossilator, but then didn't make any sound at all when I tested it. Midi out still ok, thankfully.
Connections: Retrokits KK-002 programmable cable (I said DK-002 in the video, that was a mistake), and a couple of RCA cables for audio connections.
Speakers: Generic 90's computer 'wedge' speakers that come in lots of different brand names but are all the same and all sound surprisingly good.
Chassis: Two old planks from my shed. And spray-paint, also from shed :)