How can I change the audio track from a video with an overdubbed sound track version, synch the “new” one to the “old”?
One way to do this would be to create a new channel for the dubbed audio (or two channels if the file is stereo). Add the dubbed audio to the new channel. Switch to event edit mode and move the dubbed audio event until it syncs up with the video. Now you can remove the channels that hold the original audio or create a mix of the original and dubbed.