The mki x es.EDU VCA is simple, yet efficient dual VCA for your eurorack system. It has DC coupled inputs, so you can use the VCA both for audio and CV signals. Inputs of the second VCA are normalled to the first one, which allows to split audio signal to both VCA or control both VCAs with a single CV. A 60 page build manual explains electronics behind the module and provides step-by step build instructions.