Press Start, then press Right, Left, Down, Up when the hand appears on the radio. Press Left or Right to select a new sound.
Start with less time:
Enable the "Sound test" code. Start a song, then press Up, Down, Left, Right two times, Left, Down, Up, followed by Left + 1 or Right + 1to start with 75 seconds; or Down + 1 to start with 70 seconds on the timer.
Hint: Easy route:
When given the option, select the route on the right side for more time to complete the level.