Elektor Formant Modular

on more thing: I get the gate light to lite up when you plug the cable from the Elektors gate 
input to the midi cv, but it is not reacting to any gate signal from the midi cv. So the "gate" 
light will light up but it is constant and the adsr lights doesn`t do anything, where as with 
the formants keyboar both of these light up and everything works...
Could this be somekind of a grounding issue as with the midi-cv the  ground comes from 
another powersupply?

-Wille