Apparently this decrease in volume is supposed to be a ‘feature’…
It can be really irritating and there don’t appear to be any particularly good explanations of how to solve this issue on the net; so here goes…
The problem is to do with Audition’s panning settings…
Navigate to Edit > Preferences > Multitrack (tab) and change your ‘Stereo Panning Mode’ to ‘Left/Right cut logarithmic’.
Then select OK.
Now select ‘Mulitrack’ view.
Navigate to View > Advanced Session Properties (or just press CTRL + P).
Again, change the panning mode to ‘L/R Cut Logarithmic’.
Save the session and restart Audition.
Now try and export a mixdown. You should be good to go – with no drop in volume!
Hope that helps! 
by Sean, Motion Graphic Designer
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