I wasn't to sure about this code, and honestly I don't know why they made it. My friend wrote it down and gave it too me as a joke. But anyways too do this go into the main menu screen on your game.

This cheat is called Sound Test, and on the main menu you will need to press: Select, A, B, <, >, A, Select, >. Enter this in as fast a possible, you should probably here a ding. So what are you waiting for, try it.