Utilizing the Autosync Function in Final Cut Pro
Being able to auto-sync clips can be a very handy feature when you have unlinked video from its audio source.

If you have unlinked video from its audio source in the timeline and somehow moved it out of sync, a red overlay will appear on both clips signifying how many frames by which the two clip are out of sync. If you right click or control click on the red overlay depicted in either the video or audio track, there are two options that can save you alot of trouble: Move Into Sync and Slip Into Sync. If you choose Move Into Sync, the Audio and Video clips will physically re-align themselves to regain sync. If you choose the Slip Into Sync Option, the clips will regain their sync but not physically move back together. This option would be good if you could not afford a shift if the timeline.
Learn the basics of Final Cut Pro Audio here.
