Sure, the original reason for compression was to avoid overmodulating the transmitters. Then it was to squeeze a louder sound [especially in TV, I hear].

But the Orban kit [and competitors I assume] also has another function - it does a good job of making a consistent sound with all audio. Pick any 10 CDs on your home system - the variety of mixes is infuriating, bass light, bass woolly, etc. This makes a joke of optimising your sound system and room. With an optimod [etc] you can have a consitent 'BBC' or 'Jazz FM' or whatever sound preset to your taste.

I am guessing, but is it only limited to compression? Can it not also expand a compressed input if required to give a nicer mix [of your choice]? Thats the sort of thing I would want..