Stereo mix is a surprisingly neutral nontrivial feature. How do you mix the channels, are you okay with limitations of software mixer, do you want to hardware mix it on supported audio chipsets, what stereo mix means when you have three or more microphones?
A stereo mix is in fact trivial and roughly assumes a left right speaker arrangement. Software summing is math and is the same across digital audio workstations because math is math. Are there 3 or more microphones? doesnt matter, each mic is a mono input. trying to capture a facsimile of a perceived stereo field? use ORTF mic spacing and hard pan those mono inputs appropriately.
Stereo is just dual mono. its that simple. Summing is just math, its that trivial.
Creating a mix of multiple inputs for a stereo lr output? also completely trivial from a technical standpoint. Hardly trivial from a creative pov, but that isnt what this is about.
