Control port CV in/out with eurorack kinda just worked for me… maybe we can diagnose if you explain the Zoia module setup and routing you’re trying? I think my initial test was having a Maths CV out, creating a “Cport Exp/CV In” module, Cport set to “CV” in the config menu, -1 to 1 option set (this is the Zoia’s internal value range, not the actual voltage). Then I watched as the CV value in that CV In module changed based on what Maths was doing, and I could route that into various other Zoia modules at will.
And… looks like you figured it out! Great 