To complement the sounds embedded in video clips and any narration you record, add audio clips to the Soundtrack track visible in Quick view timeline or the Expert view timeline. At times, you must scroll down the audio portion of the Expert view timeline to see the Soundtrack. These clips typically contain background music or recordings of environmental sound.
You can create snap-to markers where the beat is strongest in your soundtrack. Use the Beat Detect option in the context menu that appears when you right-click/ctrl-click the audio clip in the Expert view timeline. You can trim or add clips to the markers. As you drag or trim a clip in the Expert view timeline, the clip’s In point or Out point snaps to the nearest beat marker.
Beat markers appear as blue lines in a separate area called the Beat Track. There must be at least one beat marker in the movie for the beat track to appear. You cannot add media to the beat track.