The VCAs show a linear characteristic for which reason they are predestined for modulating the amplitude of control voltages like envelopes or LFOs. Non-critic, loud signals like VCO outputs can be controleld as well but the linear characteristic doesn't provide a good "punch" when modulated by a percusive signal like ADSRs.
Each VCA section has two non-attenuated CV inputs which are summed and then determine the VCAs final level.
per VCA: one audio input, one audio output, two CV inputs
3U Eurorack module, 4HP wide, 35mm deep
20mA current draw