In the Timeline view, I'm often trying to choose the best of several alternative audio clips for a group of slides (e.g. 1st group of 4 slides) in a longer slide presentation. I have to place each audio clip on a separate track below the slide group so that I can (select then right-click and) mute each of the tracks, except the one I want to hear. If I have a similar arrangement for the next group of slides (i.e. the 2nd group of 5 slides) in the presentation, things get awkward, because I can only mute whole audio tracks but not individual clips. This problem is behind my suggestion to add a menu item to "mute the selected audio clip".
