The Quad VCA comprises four channels of voltage-controlled amplifiers. Each channel is equipped with a 6db boost, a LEVEL control, and the CV input response can be swept between linear and exponential. Additionally, the outputs of these channels are cascaded from left to right, allowing Quad VCA to function as a four-channel mixer. This unit is in great condition and includes the original box. It comes with a black Dusty Clouds panel installed, and the original silver panel in the box.