In the current release, after clicking the chevron at the far-left so it points downward, right-click in the space at the left of an audio track and EXPAND TRACK.
Drag the line between the A&V tracks up if you need more space. 
Recordings benefit from normalizing, which in general increases their audio level without overdriving. If clips are already at optimal gain they won't be changed. Annoyingly low volume is common on YouTube videos, forcing the listener to fiddle with their player controls.
If begun with a clean cache and 
checked under OPTIONS | MEDIA, subsequent loads will be normalized.
SYNC AUDIO lines up tracks, provided both have identical audio, as shown in a video earlier in this thread. But dragging certainly does the job.
