On the plus side, I designed a panel for the row of jacks I'll be adding to the back. Most of them are just taken right from the header patchbay. Instead of a straight VCO out, I'll route the square and saw waves to separate jacks. I'll more than likely remove the jumper on the PCB between the VCO and VCF and normal it to the Audio IN. This way I can send audio through without the VCO mixed in. Having the saw and square waves separate I can route those through modules and add other VCO's, then through a mixer and back into the Audio IN on the Werkstatt. The overall plan is is to keep everything relatively simple but still useful. The thing that makes the Werkstatt so much fun is its simplicity. I could go crazy and add a daughter board with a 2nd VCO with saw/square/triangle, a mixer section, a noise source, S&H, etc etc etc all with SMD parts, then create a new case with knobs and switches galore.... but why?! I have plenty of other synths that do that.
I may add a midimplant though. We shall see.
EDIT: Updated I/O Panel above!
Once I nail down a panel design, I'll offer to do this mod if there's enough interest.