In the options menu, highlight "Difficulty" and press L, A, R, R, Y.
At the options screen press B, A, R, B, A, R, A to get the level select screen. Then press Select, A, L, A, R, Y.
Highlight the "Test Music" option, then quickly press B, A, R.
Enter options screen, set the sound to "Monaural" ,press Select, A, L, A, R, Y.
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