WHAT'S THAT THING ?
The 4VCA is four simple linear VCA.

Each VCA are independant
But you also have a common input
And a mier output.

The CV control is not on the front panel, because the module is intended to be controlled by the KNOBS module (for example)
That said, with a module like the Mult., it is possible to access these controls.

The CV range is 0 to 5V. Bellow or upper these limites, the signal is clipped. (The CV, not the input signal, of course)