Help needed to output 8 track audio master with six channel 5.1 surround and 2 channel

It may be easier to do this in Premiere. Here is a link to one solution:

https://community.adobe.com/t5/premiere-pro-discussions/exporting-a-file-with-seperate-8ch-audio-5-1-2-0/m-p/12902053

Yes I understand what you want, and there is a way of doing it in Audition, but it's very slightly convoluted. You have to do it this way though, as there is no alternative...

The first thing you do is create the six independent tracks, which presumably you've already done. Then you do your stereo reduction. Even though it will mix down as stereo, what you need is, in Waveform view, to break this into two mono files (Edit>Extract Channels to Mono Files). Now, in your Files folder you should have the eight tracks available.

Now the clever bit that's not so obvious: In Waveform view, go to File>New>Audio File, set the sample rate to that of your session but where it says Channels, either select 8 if it's there, (or Custom if it isn't and add a preset), and create an empty file folder. You will then have an empty 8-track file displayed on your screen with a row of numbers (1-8) down the RHS of it. If you click on these numbers they will go grey. Doing this toggles the 'enable' state of the individual channel. What you have to do now is disable all of the tracks except the one you want to populate - this is important. Now click on the first track from your session to open it, and copy it (Ctrl+C) (if you make no selection it will automatically select the whole track). Now re-open your 8-track file, and paste the copy into the first track (Ctrl+V). Now disable that track, and enable track 2. Go back to the session tracks and do exactly the same thing with track 2, and all the rest - remembering to alter the enable state each time, otherwise the whole thing screws up - each paste will populate whichever tracks are enabled, which is not what you want!

Finally in tracks 7 and 8 do the same thing with each extracted channel of your stereo file. Save the result and you should be done.

If you are really careful, they should all line up as well. Technically,  you can do channel enabling on the stereo file as well, and only copy one channel, without needing to extract the files to mono, but generally it's easier just to have the two files (one less bit of confusion).

To the best of my knowledge, there's no other way to create this in Audition, but this method does work!

<moved from using the community >