No, you can't do that directly I'm afraid. The reason is that Audition doesn't contain a Dolby encoder. If it did, none of us would be able to afford it - Dolby want a (not so) small fortune for licences. The closest you can get is that it's possible to encode AC3 stereo that will play correctly through a sound bar, but you won't get anything meaningful from the rest of the speakers - no surround. Mixing surround in Audition requires a sound device that can handle multiple discrete outputs that you can feed the appropriate channels to, for monitoring purposes. After that, you have to do the encoding (the expensive bit). But you really do need the right sound device to do this - you have to check carefully.
I always thought HDMI could contain a surround audio stream independant of Dolby, This ls taken from Wikepedia
'HDMI allowing up to 8 channels of uncompressed audio at sample sizes of 16 bits, 20 bits, or 24 bits, with sample rates of 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, or 192kHz.'
That's what the last bit I wrote relates to - you might well be able to get the uncompressed signals to the sound bar, but then you're in for some difficulty, because with the best will in the world, you can't do realistic mixing on it. All you can do is to see if all of the discrete channels are available, and try sending signals to them. Just because a transmission standard allows for 8 channels, it doesn't mean that every device that claims to support it utilises all of them. And according to the review I read, the Vizio 5.1 doesn't score too well in this regard.
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