RP-Distort is not just a distortion unit, but much more. The distortion unit inside RP-Distort can be combined with an analog modelled filter, compressor and widener unit. These units can be re-order, but also can be turned on or off. So in case you only want a great analog modelled filter... RP-Distort can offer this. Or only the unique widener unit which is great for widening a boring mono track.