[sdiy] Modifying CV

[Gregtronic]

So I recently purchased and assembled a Phantastron from  
Electricwestern.com which is probably the coolest thing i've ever  
gotten for 200 bucks.  Unfortunately though, the CV input is quite  
strange and doesn't track as well as I'd hope.  I have a yamaha cs-15  
which i'm trying to use as the CV out, and then i can use the audio  
input of the CS-15 and use it's filters and VCA to rock out on my  
Phantastron.  Right now it's tracking as if one octave on the cs-15  
is one 5th on the phantastron.  Is there any way i can modify the cv  
output, possibly by means of a little module in between the cs-15 and  
phantastron, that let's me scale the pitch the way i want it?  Any  
help would be awesome!


Cheers!

-Gregory