This is a handy linear VCA, which as you can tell from the name if intended for amplifying control voltages. However, it works just fine for audio signals too, which makes it ideal for a range of tasks within a modular setup. It has two attenuated inputs for CV/audio and controls for input gain and output level. It has two CV inputs for external modulation, CV1 and CV2. Only CV2 is attenuated, and I suspect this was purely to keep the size of the panel down. I find that having attenuation on both signal inputs is more useful because it in effect gives me an extra linear mixer to play with. As I have come to expect from Doepfer, the build quality is great and it looks like it belongs in a laboratory instead of a studio.