The Moon Modular M 502 S Simple VCA is a dual voltage controlled amplifier that can be used as either two independent mono or one stereo VCA.

The Moon Modular M502 S Simple VCA boasts independent inputs and outputs for each VCA and can switch between AC/DC modes to work on audio signals or control voltages. The VCA can work either in linear or exponential modes. 

Normalised connections are employed with gain modulation A, normalised to Gain modulation B, allowing both VCAs to be controlled via a single control voltage, and Signal input A is normalised to Signal input B.