curious if there's a way to access an audio track in the main comp, for syncing things up while working inside a precomp
I'm familiar with "edit this, look at that"--is that the way to go about it? or, copy/pasting the audio into each precomp when necessary?
I think it's just as easy to add the audio layer into the nested comp. You can always turn the audio off later, or just delete the layer.
The trick: making sure the audio's in point is at the same point in time as it is in the main comp. If it begins at 00:00:00:00 in both, it's moot.