Many "modeled" compressors are nothing more than futile attempts to get an off-the-shelf algorithm to match its hardware counterpart by tweaking a few parameters like the knee and attack/release times. But anyone who has worked with hardware compressors knows that there must be more to it. And there is.
The heritage of analog compressors very much showcases the history of electronics in the previous century. It's the deficiencies of the different designs and components that give each unit its unique character, and what started out as technical limitations have now become sought-after sounds. Simply approximating the most apparent features is not enough to capture this uniqueness. It takes a model of great complexity and accuracy to make a digital replica sound like the original with all settings and inputs.
Modeled analog compressor, input and output stages. Modeled everything.
Modeled "All buttons in" mode
Continuous ratio (even between 20:1 and ALL.)
Super fast attack time (just like the original)
Sweet input and output stage distortion.
Detector low and high cut filters
External side chain
Stereo with synchronized gain reduction
Very CPU friendly