Basically an insert and master bus summing combo for “thickening” the mix…
http://www.airwindows.com/console4/
It works through a channel plugin on every sound source, feeding at unity gain into the buss plugin which overrides the digital summing with Airwindows summing (more internal space, more depth, and with Console 4 it now has glue making the top-end more listenable).
from: http://bedroomproducersblog.com/2016/08/09/airwindows-console-4-free