Hidden 'Thank You!' FMV Sequence:
Insert any audio CD and then stop the CD as it begins to play from the CD player screen. Press B and then select "Copy" and press A. Choose the "Select All" option and then press A and select the "Copy" option. Create a new soundtrack and enter "<>" as a name. Select "Done" and press A.

Music Videos:
Insert any audio CD and play it from the music screen. When the music starts playing, you can see an animation in the jewel(nice). To make this full screen you have to press Y and then press X. To return to the track selection just press any other button.

Voices:
When the dash is started just leave it alone for a short time. The screen will begin to get dark, and you will begin to hear sounds. One of these sounds is an electronic voice.