Doepfer

> and also... I have to add that the module somehow still works...
> the outputs works... but when I send a cv in the cv in it seems to not
change anything...

Are you able to change the frequency with the manual frequency control ?

If yes -> probably the CV input socket or the attenuator potentiometer is
defective or broken
If no  -> probably the exponential current source around the two transistors
Q1/Q2 (both BC559) and the TL084 has a fault

You may even try the lower TL064 instead of the TL084. For the final module
the upper should be an TL084 again but for testing you may use also the
TL064 instead of the TL084.

Good luck
Dieter Doepfer