Maybe I don’t use the Ot compressor academically, but usually I do this :
Mix = Max
Rat = Max (setting used for limiter)
Decrease THReShold till the sound become lower.
Decrease Rat, adjust Gain, Thrs, Mix, by ear.
With ATacK, the compressor is engaged faster or slower, with RELease, it is released faster or slower. I usually leave default values.
For more drastic fx, lower threshold, increase attack, decrease release.
Page 2 RMS setting set to max seems maid for an audio mix, min for an individual audio track.
Manual
RMS adjusts the way the compressor works. A zero setting makes the compressor look for amplitude peaks and a max setting makes it react to the over-all energy level of the signal