Thanks Lugia! Yeah the package at Perfect Circuit Audio has the format changer box I think for the Phenol:
https://www.perfectcircuitaudio.com/kilpatrick-audio-phenol-patchable-analog-synthesizer.html
I am thinking this combined with either the Sound Machines Modulor 114 and Koma Field Kit would be tons of fun to get started with along with the Endorphin.es system. I priced out the cheapest Buchla and cheapest Serge system and the Serge was over 3k and the cheapest Buchla was 5k! So for what just one of the Buchla or Serge cost, I can have 3 portable modular systems and change left over! Then I can think about building a rack from scratch.