It's their saturation for one (Mixbus) and I feel it even widens the stereo field
doing nothing but dropping the clip in...I can hear a noticeable "widening"
the very second the clip is dropped in (but that may just be me

)
The Sonar Console Emulators are supposed to have somewhat the same
effect, but not anywhere near as "foolproof", or as easy, as Mixbus.
I remember when I first touted Mixbus here in the forum, and everyone was
"nah...can't be...it's just a DAW...etc..."
I said "There is absolutely a noticeable difference and the sound is vastly
improved by doing nothing more than dropping your clips in to it - there
is definitely some MOJO going on here..."
After they tried it....the rest is history...
It is, IMO, by far, the best "sounding" DAW out there...whatever
their MOJO is...it works...and I like it...