I want to add multiple audio tracks to my video. I begin by adding one track to the Audio Mix line. I now create an additional audio mix line so I can add an additional track, because I do not want this new track to overlay with the previous one--I want to mute a piece of the former where this track comes in. However, although another line is created when I click the Add Line option, I cannot drop my new track into it (it overlays the first audio mix track, and blends with it, which I do not want). I was certain that multiple audio tracks could be added to their own lines in the Video Editor--am I wrong? Thanks.