The VCA-4MX consists of four individual voltage controlled amplifiers.
All amplifiers are identical and work in a
semi-logarithmic mode. The semi-logarithmic transfer function is much more
practical than a true logarithmic because the semi-logarithmic mode "imitates"
the natural behaviour of volume controllers. Amplifiers accept both DC and AC
The VCA-4MX has eight outputs for maximal flexibility. All amplifiers has an individual output, two summing otputs for all amplifiers (both normal and inverted) and additionally two summing outputs for VCA1 + VCA2 and VCA3 + VCA4. The VCA-4MX can be used as quad attenuator (using all four amplifiers separately), as a four input mixer (using summing outputs) and as two separate two inputs mixers.
All amplifiers has a dedicated level controller (knobs) and CV inputs which controls outgoing signals attenuation in semi-logarithmic mode. The manual controllers (knobs) determinates the maximal amount of controlled gain.