The GMSN! Pure VCA is a real workhorse module, used to control the volume or amplitude of an audio or CV signal. This is controlled either by the offset knob, or automatically using a control voltage.
The THAT2181 used in the VCA is used in high end audio kit giving excellent signal to noise ratio.
Checkout the Ask.Audio review of the Pure Modular for more info and sample audio.
Power: 7mA 12v; 7mA -12v