Final Cut Pro X: split edit
In Final Cut Pro, you can set separate video and audio start and end points in an individual clip. These edits, known as split edits, are a common technique in most dialogue scenes in films and television shows. You can use split edits to introduce the sound of a new shot or scene before cutting to the video of that shot or scene. Conversely, you can use a split edit to extend the audio of a shot over a subsequent shot.