Are you sure? I have had the functionality for years. I'm doing mostly "radio" one track recordings and it has never been a problem before. I'ts a shame I haven't used Audition on my mac at home for some time, we have it running on a PC at work where I do most of my recordings. And as far as I can recall I have not updated the MacOS or done any changes in Audio/Midi Setup for a long time. I have tried to shift D, LFE, L and R, no luck.
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