I just spent three days pulling my hair out over this, but it’s now working. It was Largely down to my overall lack of knowledge of all things Electron / CV / and cabling having only just left the safety of Ableton. All those factors together left too may parameters and order of doing things in the air and it took bloody ages.
The breakthrough moment came after doing point 5 above, Calibrated cv via Minitaur editor by pressing and holding c2 while sending 1 volt, then pressing c4 and pressing 4 volt. I had already tried this days before but must of been doing it wrong. The Minitaur definitely needs this and it’s the cause of all the single pitch or low rumbling noises you hear before this is sorted.
Now working fine with the two extra CV outputs controlling Filter and Resonance.
Very nearly gave up, so do persist it is doable.