How do you activate cheats codes on Guitar Hero 2?

on the main menu (after it says "press any button to continue"), you put in the code. here is hyperspeed: O,B,O,Y,O,B,O,Y If it dosent work the 1st time, just keep trying: O,B,O,Y,O,B,O,Y,O,B,O,Y,O,B,O,Y... And so on.