This is another strange beast from Melda! It's actually not a limiter plug at all. In fact it's a saturation plug.
You get an input gain and a threshold control and a variety of curve shapes. The main point seems to be the dedicated harmonic controls. The harmonics are added after the saturation stage. You can crudely imitate analog gear perhaps.
As is typical of Melda the instructions are pretty much non existent and the interface doesn't look too great. I would recommend running this through an analyser for an hour or two until you actually understand the way it's put together. One big plus is that you get a really good bunch of presets with this thing.