Doepfer VCA Modular Synthesizer at a glance:

The A-130-4V Quad VCA from Doepfer is a quad VCA with common control for all VCAs and a linear characteristic curve. The module is suitable for polyphonic patches, simultaneous level control of up to four audio or CV signals and quadrophonic patches. Manual opens the VCAs simultaneously as required, CV regulates the effect of a control voltage on the four VCAs. The Quad VCA is equipped with two pin headers at the rear. One of the pin headers is used to normalize the four inputs internally to four signals from other modules (e.g. Quad LFO A-145-4 or A-147-5 or Quad ADSR A-143-2). The other pin header can be used to connect the four outputs to other modules.