Final Cut Pro - A Faster Way to Pan Audio
Blindingly Fast, Dead Easy.
In Final Cut, you can only adjust panning by clip.
However, here's a neat trick. Open your sequence in the timeline and select all the clips you want to pan to one side and choose Modify > Audio > Pan Left, or Right, to pan all the selected clips to one side.
This is all to one side or the other, nothing in the middle. Still, it's faster than doing it one clip at a time.