Have you tried quick controls or automation?
The VST synthesizer called Retrologue 2 includes sidechain input, with which you can send an audio signal from any source within Cubase and process it via the Synthesizer’s features, including filters, modulation, distortion, envelopes, amplifier, an arpeggiator and also the effects module.
If this doesn’t answer your question, maybe you could provide some details in order to make a better suggestion:
- What parameter on which plugin or effect are you looking to control?
- Which is the origin of your control signal? Is it generated within a track? and if so, is it the same or another track?
Otherwise, do you want to use a MIDI controller to create the control signal?
Cheers!