[Greg McKaskle]

You can use it similar to a potentiometer.

The knob translates a graphical angular value into a numerical one. It isn't necessarily a voltage, but you can define it that way if you like.

If you need to customize it, you can grab the ends of the scale using the positioning tool and move them to the physical locations you like. You can type different values in for those locations. These numerical values define the units that the knob will return.

Greg McKaskle