The Dark Energy is equipped with an initial gain control for the VCA. It's the VCA control labelled "Amp.". This control can be used to open the VCA without using the Envelope (ADSR) or LFO. If your Dark Energy generates a permanent tone this control is probably not set to zero. For details please refer to the Dark Energy user's manual on page 16. If you have problems with the Dark Energy controls we recommend to start with the basic settings described on page 6 and continue as the manual says.