What would it take to design a circuit for voltage scaling the CV input? (Hz/V or V/oct)

Hi Thomas, sorry we missed this post and didn’t set it to be viewable sooner… had a lot of spam recently so things are locked down for a bit…

Hz/V and V/oct don’t have so much meaning for the VOS. To begin, there isn’t really a solid connection between volts and pitch on the CV input. Like the knobs, it will affect pitch, but in a somewhat non-linear manner. The influence of the OSC 1 and OSC 1 & 2 range knobs actually depends on the setting of the other knobs. For instance, a 1/8 rotation turn in one configuration would have a different effect than that same rotation in another group of settings. Another way to say this is that one Control_Voltage isn’t always E or whatever.

You could, however, scale the inputs. Scaling down would be easier. Just run the driving voltage through two resistors in series, and then take the middle voltage out to the synth. If the resistors are equal, the new voltage will be about half the original. I say ‘about’ because the input isn’t buffered, so the knobs on the synth will influence the voltage dividing resistors. Going the other way will likely involve some opamps.