What's the easiest way to unlock the audio track from the video track? So you can slide them around and throw the audio out of synch...

Click the audio track and hit U (Ungroup).
Slide it around to your heart's content :-)

Click the audio track and hit U (Ungroup).
Slide it around to your heart's content :-)

Wow! Easy! so if you want to reconnect them?

Select both audio/video and hit "G" for Group.