This problem keeps coming up on various projects and I have yet to find the best way to recover from it: A project will be synced with incomplete production audio. Either it will be delivered to post late or an AE brought it in with the incomplete number of channels.
I'm trying to find the best way to conform audio to an edit that has already been cut with all channels accessible in the timeline. FYI, the audio I would need to conform usually has the same timecode as the audio already in the cut. It sort of works to match frame and resync to the original nested/merged clips but if, for example, the audio is 5 channels the audio shows up in the timeline nested as 2 channels. This means every time I need to do a production audio edit I have to match back to the nested clip and edit there instead of the actual edit itself.
I know I must be missing something here that could make this really easy to recover from. Often the circumstances in which this happens are completely out of my control.