That's a buffered output board for the analog computer Confetti. One can use it as an audio output stage. That make the Confetti compatible to every analog synthesizer that like for example the Doepfer Eurorack synthesizer
The Confetti103 Buffered Output was designed by Wolfgang Spahn 2015-21.
It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.