Agreed. It shouldn't require these steps, but at the moment its the easiest workaround until Adobe fixes the bug. Also, I don't know if I would use .mp3. At least use wav. mp3 is a lot of compression. In our situation we sent all of our audio out as an OMF to a mastering house. (We're working on a television show and have the budget). When it returned we laid it back in as a single clip. You can do the same if you either A. export as a wav or B. send to Audition, master, then export as a wav. After that you just wipe your sequence audio and lay in the new FULL tracks. Also if you aren't delivering Prores, h264 seems to work fine in most cases (we have experienced popping on random occasions). We definitlely experience it while exporting multichannel audio Prores files. I would assume DNx will behave the same, but I haven't tested it.
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