What is audio delay on the Bose 3-2-1?

It has 3 different delay settings from which you can choose. However, it can only delay - not advance. My problem is that when I set the TV sound to go through the Bose, the TV sound is delayed and I would like to advance it so the 2 are synced. Because it does not advance, it is of no help in this given example. If you needed the sound delayed slightly, it would be of benefit.