via Examples for application of the DIY Synthesizer Board on Doepfer.de.via bauke
"I noticed 2 extra PCB's of which i recognized the CGS mixer. the other one is located behind the DC mixer, so possibly it's also a small CGS thingy."
Fourth shot below is from another featured here.









































For the Serge-style one: the add-on boards are both CGS04 Mixers. One configured for audio, the other for DC.
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