Why does compressor settings of aac audio, stereo, create 2 channel mono from 2 discrete audio channel movies?

Why does compressor settings of aac audio, stereo, create 2 channel mono from 2 discrete audio channel movies?

well depending on how your audio is brought into your system you can select it as two streams of mono or a stereo pair. In reality, unless it's mixed in stereo, that's just two streams of mono locked together. Other streams brought in via other means, can have a lot more audio channels, e.g. 8, 16, 24.
  In your case, with what you're doing, two separate channels works best, so you can control the levels of two very different audio sources. If, for instance, you were taking the feed from the mixing board during a concert, you might want their stereo out. Otherwise you might be dealing with the 1.2 zillion channels that they're mixing live.
   I like separating the tracks coming in. I work with people who prefer to lock them together. Locking means the tracks move together during editing. Ok, fine, but I'm usually dealing with different audio sources, like you are: a camera mic (safety on location) and a close mic (shotgun, lav). Or I have a shotgun source and a lav. I want to determine the best source audio for the shot. Sometimes it's a lav, sometimes a different feed from somewhere else, sometimes the shotgun, and sometimes a mix of two sources. But if they're locked together and pre-set to come out evenly from both speakers there no way for me to make a determination. The other guys like to cut and figure out the audio later.
  To each his or her own. . .

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