It takes a bit of effort to work out exactly what this module can do, but once you have it worked out it's intuitive.
You get two 1 > 4 active mults.
One 4 > 1 mixer. Audio or VC.
If you want to mult a signal as well as mixing it, the normalisation available can handle that.
...there's only unity gain available, but the point is that it has precision accuracy, so no problem to use it with voltages that are already quantised.
Additionally the input to each mult can be inverted if desired, again it's a precision operation so good for 1v/oct signals.
Nicely made, skiff friendly and looks suitably impressive.