You decide how Premiere interprets the audio yourself, so I have no idea how your Premiere Pro interprets audio. You'll have the answer in your Timeline preferences. So does Premiere just not allow multichannel exports with several pans then. It can export multi-track audio. You don't have much control over how video player software interprets these tracks, and how they're panned. A broadcaster may want 8 tracks, where the first two are stereo, and the rest are mono. When they use it, they will have their software set up to pan some tracks to the center and some to left or right. Premiere itself will interpret them as mono by default if you re-import the files, but you can change this, and you can also pan them any way you want. But if you want the audio to be panned in a certain way when you edit or play the timeline, you will have to have a sequence set up correctly, with Multi-channel output, not stereo or 5.1, and all the tracks must be routed correctly. If you have this, you can just drop the file in the sequence and hit Play. Remember: All this is just metadata. In the end they are all just tracks of audio. All of them are the same! A stereo pair is just two mono tracks tagged in the metadata as stereo. Because of this metadata tag, most players know what to do with them, and will pan them left and right. The panning of multi-track audio can only be tagged in the MOV container. See screen shot of Audio tab in Export Settings. That doesn't mean other formats won't work. If the playback software is set up accordingly, everything will be panned correctly. They're all just audio tracks, anyway. But that's not something you can do when you export, it's something they do in their software.
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