After adding a video clip to one of my tracks and trimming it, there is left-over sound from the clip but no video. I tried deleting the clip but it doesn't affect what's "left behind." There's nothing to see so I can't remove it. I did "split/cut" the clip (in two) in an effort to delete half of it because even when I trimmed it, the section of audio I didn't want just stayed on the track. Any idea what might be causing this AND how can I get rid of the audio I don't want?

Thanks.