Mapping audio in export

Hi all,

I've been looking around, and found a few helpful things concerning mapping audio channels to different tracks on output in Premiere CS6. I've done this plenty of times before in FCP7. I've found out that I can set my stereo files to dual mono and such, and that I can set my master track to multichannel in order to export those audiotracks seperately to a quicktime or another format.

What I can't figure out yet, is how to do this exactly. I've gotten to setting my channels to mono by default, so no problem there. But how do I set this Master Track to multichannel? I've tried pixel hunting in the audio settings in the audio mixer tab, but that didn't help. And I can't find anything in audio settings. And every post I find concerning this kind of leaves this step out as to how exactly do this.

So my question is: how do I export my different audio tracks into separate tracks in Premiere CS6?

Thank you so much :)

Brecht