Cgs synth

Hi Everybody ! That's my first post here, as after building several modules, i think i've got some problems to fix on my cgs48. I've used a 2N3904 matched pair instead of the LM394. I think that my vco is working, but i can't really use the initial freq pot. It must be always in its center position if i want to hear the vco. Is it normal ? I only can tune the vco using the fine pot... In a post here, i've seen i could change the 1m resitor to a 2,2m one, and i did this change, but it just affect the fine tune pot, no the intial one. What should i check ? thanks for any help ! jean