Doepfer

ok, i understand that a modular system is maybe not the best place to 
fit a vc radio receiver, it's more a standalone kind of stuff.

but i'm decided to try to build one myself. i've been looking hard on 
the net for schematics on how to control the tuning from a voltage 
but never found anything i could understand. if anyone have some DIY 
idea for this, please let me know.  thanks