Enter the following codes with your guitar controller at the cheats menu for the desired effect.

GREEN, GREEN, RED, RED, YELLOW, BLUE, YELLOW, BLUE - Always Slide
YELLOW, GREEN, RED, BLUE, BLUE, BLUE, BLUE, RED - Auto kick
RED, RED, BLUE, YELLOW, GREEN, GREEN, GREEN, YELLOW - Air instruments
GREEN, GREEN, BLUE, GREEN, GREEN, GREEN, YELLOW, GREEN - All hammer-ons and pull-offs
GREEN, GREEN, RED, RED, YELLOW, RED, YELLOW, BLUE - Contest winner 1
YELLOW, GREEN, RED, GREEN, YELLOW, BLUE, GREEN, GREEN - Focus mode
GREEN, RED, GREEN, GREEN, YELLOW, GREEN, GREEN, GREEN - Clean screen (no HUD) mode
GREEN, RED, YELLOW, YELLOW, YELLOW, BLUE, BLUE, GREEN - Invisible characters
YELLOW, YELLOW, BLUE, RED, BLUE, GREEN, RED, RED - Performance mode
BLUE, BLUE, GREEN, GREEN, RED, GREEN, RED, YELLOW - Unlock all characters