VCA4p

4 OTA-based VCAs + Mixer output -- Black panel

"This module is 4 VCAs in an 8HP package. The VCAs are fairly straight forward OTA based designs, pretty close to the Polyfusion VCA and just about every VCA from the 70's. The CV is exponential and there is a mix out at the bottom so it's a 4 channel CV controllable mixer."

http://www.bubblesound-instruments.com/VCA4p.html