SynthModules

I need a bit of help here.  I'm using my Moog Prodigy for a keyboard. 
If I plug the CV OUT into my Blacet or ARP VCOs, everything tracks
perfectly as expected.

I was having strange things happen when I used the Prodigy to feed notes
into the PSIM for one of my sequencer programs, so I was trying to write
a little program that just took the voltage at IN-1 and sent it to
OUT-1.  Divide by 16 then * by 32 or something...

So I plug the Moog into the PSIM IN-1 and the PSIM OUT-1 into the ARP
VCO and everything should still work...   Well the first octave (F-F)
works fine, but as soon as I go above that on the keyboard I get
incorrect intervals happening.

Someone tell me what goes in the blanks (multiply by this, divide by
that, etc) to make this work properly:

GOSUB SCANADC
DAC1V  =  ___________ ADC1V _____________
GOSUB LOADALLDACS

thanks!
Andrew