Instructions
Scroll down to "Options" in the game's main menu, then select "Calibration settings." Select menu items by pressing the green fret button on the guitar controller.
Depress the green fret to start audio calibration. Hold the guitar controller up to one of the speakers with the transparent circle near the "Start" button facing the speaker.
Hold the guitar controller in place until the calibration progress bar on the screen fills and the game screen tells you to calibrate video lag.
Hold the guitar controller a few inches from the screen and press the green button. The screen will flash while video lag calibrates. The progress bar will fill as calibration occurs.
Press the green fret button after video calibration to return to the main game menu.