I have a Moog Sub 37 Analog Synthesizer and a Korg SV-1 keyboard. Can I take the audio out of either the line outs or headphone out of the Korg and plug it into the volume or filter Control Voltage (CV) in of the Sub 37 to affect those controls as a control voltage? Moogs take a +/-5V CV signal. I'd just go ahead and do it but I don't want to damage anything.
If that can't be done directly, is there a way to convert an audio signal into a control voltage signal?