Funny thing about on air processors (Orban or so) is that they come with like 40 presets, I remember when I started working at a rock station back in my country, that frequency was a talk station before and no one ever bothered in changing the processor, one day the Engineer was around and I asked him to go to the tech room and told him to load the preset "rock-medium"... Guess what happened? The station came alive, just with a simple preset.
This was in a mom and pop owned station in South America, my point is, Orban engineers invested the time and resourcrs to search, design and create the best presets for each radio format and loaded them in every single semi-new processor, in no way an average Joe will come with a better sound guessing by ear with a $300 set of headphones. Just my humble opinion.
Many stations use the presets as a start point. They try different ones, and then find the closest to what they want, and then tweak.
The reason for tweaking is that the Orban and Omnia designers can not know what is up ahead of their gear. Any leveling or AGC system will color the audio, and must be adjusted for in the Omnia or Orban gear. And then there is the combination of the Nielsen encoder and the Voltair... requiring certain additional tweaks.