Instructions
Rock Band Series
Tap the strum bar down on the guitar to navigate to "Options" on the main menu. Press the green button on the neck of the guitar.
Scroll down to "Calibration Settings" and press the green button. Choose "Calibrate Manually."
Strum down on the guitar every time you hear a drum beat. Continue to strum until you do not hear any more beats. This calibrates the audio portion of the guitar and game.
Strum down on the guitar every time the the needle touches either side of the meter to calibrate the video portion of the guitar and game. Continue to strum until prompted to stop.
Press the green button to confirm the calibration and return to the main menu.
Guitar Hero Series
Strum down on the guitar to highlight "Options" from the main menu and press the green button on the neck of the guitar.
Scroll down to "Calibrate Lag" and press the green button.
Strum down on the guitar whenever the note crosses over the target in the center of the screen. Repeat until no more notes appear.
Press the green button to accept the new calibration settings and return to the game.