> Today I noticed a strange behavior in my Dark Energy I. I noticed a constant modulation of the cutoff frequency. It
> sounds like the cutoff is being modulated by an audio-rate square wave. Of course I ruled out any bleed by whatever
> internal CV sources are available. The modulation won't go away.
> Maybe the CEM3394 has turned bad If so, I have a Simmons SDS-800 which I don't use which has 4x CEM3394 chips inside. Is
> there anything I have to consider when swapping the chip myself (apart from the obvious need to re-calibrate various
> parameters in the Dark Energy)
>
>
> kind regards
> Frank

If it's a faulty CEM3394 replacing the circuit should fix the problem.

Best wishes
Dieter Doepfer