Hello

First time on this forum.

I've just bought a Doepfer modular and I'm have a slight problem with the A101-1 Vactrol filter.

Whenever I connect anything to one of the CV inputs I get a lot of background noise/interference. This happens even when the corresponding CV control is zero and even when connecting to sources with no control voltage output (e.g. mixer input or reset on LFO)- so its not CV opening the filter.

Any ideas anyone Do I have a faulty filter