That's because you're in AUDIO settings, you need to come out of there and go into MUSIC settings, which, according to page 26 of the manual, IS on your BDP:
[Music Settings][System Settings]x [Parental Control Area Code]Playback of some BD-ROMs, DVD VIDEOs, or Internet videos can be limited according to the geographic area. Scenes may be blocked or replaced with different scenes. Follow the on-screen instructions and enter your four-digit password.x [BD Parental Control]Playback of some BD-ROMs can be limited according to the age of the users. Scenes may be blocked or replaced with different scenes. Follow the on-screen instructions and enter your four-digit password.x [DVD Parental Control]Playback of some DVD VIDEOs can be limited according to the age of the users. Scenes may be blocked or replaced with different scenes. Follow the on-screen instructions and enter your four-digit password.x [Internet Video Parental Control]Playback of some Internet videos can be limited according to the age of the users. Scenes may be blocked or replaced with different scenes. Follow the on-screen instructions and enter your four-digit password.x [Internet Video Unrated][Allow]: Allows the playback of unrated Internet videos.[Block]: Blocks the playback of unrated Internet videos.x [Super Audio CD Playback Layer][Super Audio CD]: Plays the Super Audio CD layer.[CD]: Plays the CD layer.x [Super Audio CD Playback Channels][DSD 2ch]: Plays the 2ch area.[DSD Multi]: Plays the multi-channel area.
[Music Settings]
[Super Audio CD Playback Layer]
[Super Audio CD]: Plays the Super Audio CD layer.
[CD]: Plays the CD layer.x
[Super Audio CD Playback Channels]
[DSD 2ch]: Plays the 2ch area.
[DSD Multi]: Plays the multi-channel area.