I'm trying to experiment with the new DD and DD plus features that were added to Audition CC 2014. I can create a 5.1 mix easily in the multitrack editor, but don't see anyway to set up a 7.1 one.
I can create a custom configuration in the wave editor with 8 channels and export as a DD plus 7.1, but you really can't do a mix there easily.
I can't seem to find much information about it other than vague mentions that you can create 7.1EC3 files, but no specifics on how to do it. Mutitrack editor seems to be limited to outputting only 5.1.