its an advanced compressor -Good one too!
On top of a 4 part compressor, you also have filters, and that is what Q and S controls.
'S' is saturation of the filter-parts
'Q' is (always) resonance
Detection is modes of compression -kind of 'reaction' to the input -a t&e setting imo.
How a compressor actually work, you can learn from this :
https://www.soundonsound.com/sos/sep09/ ... deeasy.htm
(lot of popups so take care)