I have only seen "edit audio" to switch form VD to AD, but than I can only add this track, not add additional tracks, and there is no video preview too.
So I first produced a video with VD, I think I add the voice commentary in VD too. Than I imported the produced file in AD, edited and added music, ambient sounds ... and have to proudce the video a second time. Is there no workflow of changing between VD and AD and back to VD, and than produce video?