Forgot to say, the 2nd pair of outputs feed directly into my Headphone Distribution amp for monitoring.
 
I have used a 3rd pair when running an External Insert.

The best way to remember it is that Sonar will sum ALL output pairs routed to your interface when you use entire mix - because that's what it is - the ENTIRE mix.
Main Outs are nothing but main outs. A single stereo pair

Okay, that's making sense. The 18i6 has limited outs but there is headphones, SPDIF and the Mains. I'd have to check but obviously I chose the mains any time I did that. Still seemed to create that third (or second) do nothing file.
 
Then with Entire Mix I worry about all the busses I create, their M/S states, FX busses... oi, too much to worry about on a complex mix.
 
If a Master Bus export cranks out what I'm actually hearing that's good enough for me (usually all my busses lead to a premaster bus then that points to the Master).
 
Still a definitive video covering track, bus, entire mix, MIDI, OMF, and any combo of export types would be brilliant. Just do every single type of export humanly possible with Sonar and toss it in a vid. Then even show how to import those files into new projects or other programs/DAWs (like video software, sending stems to studios using other platforms, whatever).
 
Heck... I don't care if it ends up being 5 HOURS long. I'd totally watch it. lol...

Never knew you could export with nothing selected, interesting. Quick question: let's say at the end of my track there is an FX tail that continues playing past the edge of the last clip.  Will export account for that with nothing selected and only end the export after complete silence occurs?

Spencer
Never knew you could export with nothing selected, interesting. Quick question: let's say at the end of my track there is an FX tail that continues playing past the edge of the last clip.  Will export account for that with nothing selected and only end the export after complete silence occurs?

No.
 
In a case like this, play your project and right at the end, slip edit the right hand edge of a clip - any clip - (but it makes sense to use one of the tracks that contains the longest decay) lengthening it so that it ends exactly on the point where the decay fades to zero.
 
Now when you do any form of export, the full length of the song is captured. You might have to crank the volume right up to get a real idea of what's going on down there so mind your ears (and monitors).

Bristol_Jonesey
FWIW, I always select Nothing when doing a mixdown (ctrl + shift + a)

Please to explain this. When I select nothing, the export dialog options are all grayed out.

That's odd.
Just to be clear- in Track View, hit ctrl + shift + a
 
I've just done this on my current project in Platinum and it works just like it's always done.
I've been doing this since version 6PE
 

Of course it helps to have your audio device turned on...