The 4VCA 31B is 4 individual high quality low noise linear Class A VCAs on a single panel . The 4VCA is also an excellent voltage controlled 4 x 1 sub-mixer for both audio and DC voltage control.
An essential module for medium to large systems.

With switchs in AC mode: the VCA inputs are capacitor coupled for minimum offset feed through, for audio only with no 'thumping'.

With switchs in DC mode: the VCA inputs are direct coupled to the VCAs and can be used as voltage controlled attenuators for CV processing.

The four VCAs are normalled to the Mix output for combining
all 4 channels to one output. Inserting a plug into the individulal
VCA Outputs breaks the connection and removes it from the mix.
As an example: it is possible to be mixing 2 channels of audio and using the other 2 for DC processing . Many other combinations are possible.

Features:

4 VCAs with separate panel controls, attenuators and CV inputs
Low noise Class A design
75-80dB of control range
Linear response
Mix out for all 4 VCAs combined

Specifications:
4 Class A VCAs
Input: 10V P-P
Output: Unity
CV input: 0-5V
75-80 dB control range
linear response
Current Draw:
70mA at +15V
65mA at -15V