This is, at heart, a collection of 3 offset and scale units, so, if X is the input, the output is AX+B for constants A and B. Each works very simply, with a very clean interface, indicated on the front panel, so you know what goes where.
Wher it gets better is that the scale factor can be negative (via a switch), and the offset can be switched on or off. So the functionality includes attenuversion, offsets and (with no input connected) CV generation. Plus, there are common input and output, for summing the channels, so you also get a mini-mixer, or signal booster.
And it works for both CV and audio signals.
All in a rugged, well-designed module with a very clean front panel. Well worth it.