Karaoke Revolution Volume 2 Cheats

Go to the Cheat Screen or Press Start screen and
press Circle, Circle, Right, Right, R2, R1, R1, R2, Circle, R2.

You can trick the game by humming, rather than singing, at the correct pitch.

Finish all songs in each venue with platinum (easy mode) and receive Cheat collection 3:

Tough Crowd audio cheat: RIGHT, UP, CIRCLE, CIRCLE, CIRCLE, R2, R1, R1, L2, DOWN
Pirate Crowd: SQUARE, SQUARE, LEFT, LEFT, R2, L1, R2, R1, CIRCLE, L2
Robot Crowd: CIRCLE, CIRCLE, RIGHT, RIGHT, R2, R1, R1, R2, CIRCLE, R2
Zombie crowd: LEFT, L1, L2, SQUARE, SQUARE, L2, L2, L1, LEFT, LEFT