5.1 mp3 mixdown yields 2.0

Mixing down my very first 5.1 test file (yeah 5.1!!!!!) to mp3 yielded a sound file that did indeed play out of all five speakers, but only in stereo.  What was supposed to come out of my LR speaker came out LF and LR equally.
Is there something I need to know more than just what is presented in the mp3 save file box?

_durin_ wrote:
Audition can export surround MP3's.  I just did a quick test and it worked as expected. 
Well, there you go - I did say that I hadn't tried it! I think that MusicConductor is right, and there's no such thing as a 'preferred format' at all. What the public would prefer is that all these problems weren't there, and they could just listen to two channels through the two ears that they have - whilst also trying to deafen themselves into the bargain at the same time by listening to them on headphones at loudspeaker levels.
Surround is the Next Big Thing - and it always will be. As far as I can make out, even Apple aren't particularly interested, and seem to regard it as something that games manufacturers are more concerned with than the public at large. Nobody can agree on anything like a universal format, or whatever, and all the time it remains like this, it's doomed. It would take at least Apple to say 'look, this is how we're going to do it, and by the way everything's going to be coded like that' before anything would change at all - and that seems incredibly unlikely to happen, what with all the proponents of the various forms generating more heat than light.
I've got loads of Ambisonic surround recordings - my SoundField mic makes them by default, and I always record its B-format output. But I've never tried listening to any of them as surround, ever. None of the customers want surround either - nobody ever asks for it. For me, the only reason for recording them like that is so that I can steer the stereo field after the event, which is often incredibly useful. What's even better is that I can do this natively now in Audition CS6, because of its support for multi-channel plugins.

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