I'm running into a very frustrating problem. I feel like an idiot asking this question, because After Effects HAS to have some built in function to achieve this. It's so simple.
I have production footage of a man speaking in front of a greenscreen that I'm running through keylight. All the clips have two discrete audio channels for a boom and lavalier mic that I am trying to keep separate. Unfortunately, After Effects seems to want to flatten the audio channels on export, no matter what I do. Is there any way to let the audio channels pass through unchanged? My client wants access to the untouched audio and this is getting in the way of me making a deadline.