Precise selection of parameters - Every step has an audible difference and there are many many steps.
It is a saturation and it will pin the low end down, meaning you will lose dynamics, but works nicely, and very nicely on Sides.
Pushing the Drive, reveals the saturation point at the frequency selected by the color knob underneith the Drive knob. Once you tune it to the frequency you want, then back the drive down to re-introduce dynamics and lose the too much saturation effect. You just drive it to see where you are color-wise. Then, back down and blend it in 30 -80 % while adjusting the gain to control the wet signal's dynamics.
The sweet spot for every knob is where it has the text (Left channel)