Enter the following codes with your guitar controller at the cheats menu:
Air instruments - RED, RED, BLUE, YELLOW, GREEN, GREEN, GREEN, YELLOW
All hammer-ons and pull-offs - GREEN, GREEN, BLUE, GREEN, GREEN, GREEN, YELLOW, GREEN
Always Slide - GREEN, GREEN, RED, RED, YELLOW, BLUE, YELLOW, BLUE
Auto kick - YELLOW, GREEN, RED, BLUE, BLUE, BLUE, BLUE, RED
Clean screen (no HUD) mode - GREEN, RED, GREEN, GREEN, YELLOW, GREEN, GREEN, GREEN
Contest winner 1 - GREEN, GREEN, RED, RED, YELLOW, RED, YELLOW, BLUE
Focus mode - YELLOW, GREEN, RED, GREEN, YELLOW, BLUE, GREEN, GREEN
Invisible characters - GREEN, RED, YELLOW, YELLOW, YELLOW, BLUE, BLUE, GREEN
Performance mode - YELLOW, YELLOW, BLUE, RED, BLUE, GREEN, RED, RED
Unlock all characters - BLUE, BLUE, GREEN, GREEN, RED, GREEN, RED, YELLOW