Sonic's Secrets: Crue Ball.
Choose 'Music Demo' from the title menu and select Track #6 (Twisted Flipper).
Now press A, C, A, B and begin a new game.
Before you launch the ball, press:
B + Up (Toghether) to advance a level,
or B + Down (Toghether) to backup a level.
First enable the Skip Level code above.
You'll be able to enter a full sound test at any time during the game by pressing:
A + B + C (Toghether).