Doepfer A-185-2v is a multiple module for modular synthesizers in Eurorack format. It can be used as a precision adder (mixer) and buffer for control voltages. Precision adder means that the signal gain at the inputs without attenuator is 1. When controlling VCOs, this means exact tracking of 1V/octave. The A-185-2v can also send several control voltages simultaneously to one or more VCOs. The A-185-2v can also be used as an octave switch, as the toggle switches generate an offset voltage of 1V when the input is not connected. Here is the Vintage Edition.