> nevermind, i found the reply from Dieter. I hope there are affordable multipiers out there....
> Doesn't the A-137-1 need multipliers as well

No the A-137-1 only requires OTAs (or VCAs). These are also so-called "two-quadrant multipliers": one bipolar input (the audio
input) and one input positive only (the CV input). The multipliers for ringmodulators (which are used in the frequency shifter also)
are so-called "four-quadrant multipliers" with two bipolar inputs.

Best wishes
Dieter Doepfer