A classic linear VCA that use a LM13700 OTA (Operational Transconductance Amplifier) as it’s core.
The 2 inputs are DC coupled and each have an attenuator knob.
There is 2 CV inputs with one that can be attenueted.
The gain knob can be used for creating drones if you don’t have a CV signal to feed in.
You have to feed in a 5V positive signal to obtain unity gain.
Signals greater than 5V can be attenuated by the CV2 knob.
The distortion is very small (<2%).