Re: Fatman: Adding a tuning knob, and other mods
I'd say build it up on a temporary (cardboard, plastic, etc._) panel and then after it's working, make changes from there.
You already have a sort of dual control with the panel pitch control working to set VCO 1 and the VCO 2 Offset control working to set it with respect to the first.
Adding the new load of a second control to the Pitch CV might introduce tuning error or limit.
Did you see the modifications over in the technical bulletins section? viewforum.php?f=15
Here's to success!