This game is also available on PS2.
At the character selection screen, hold L + R + Z then enter the following code:
DEEBO= X,X,A,A,B
DMX= X,A,X,B,Y
FUNKMASTER FLEX= X,B,X,X,Y
RUFFNECK= A,Y,A,B,X
ICEBERG= Y,B,X,Y,X
LUDACRIS= X,X,X,Y,B
METHOD MAN= Y,X,A,B,X
N.O.R.E= X,Y,B,A,X
REDMAN=X,X,B,Y,A