2009 GMC Sierra 1500 Crew Cab Owner's Manual - Page 295

Now the album name is displayed on the second line between the arrows and songs from the current album begins to play. Once all songs from that album are played, the player moves to the next album in alphabetical order on the CD-R or CD-RW and begins playing MP3 files from that album. To exit music navigator mode, press the pushbutton below the Back label to return to normal MP3 playback. BAND: Press this button to listen to the radio when a CD is playing. The CD remains safely inside the radio for future listening. CD/AUX (CD/Auxiliary): Press this button to play a CD when listening to the radio. The CD icon and a message showing disc and/or track number displays when a CD is in the player. Press this button again and the system automatically searches for an auxiliary input device such as a portable audio player. If a portable audio player is not connected, "No Input Device Found" displays. Using an MP3 (Radio with CD and DVD Player) MP3/WMA CD-R or CD-RW Disc Compressed Audio or Mixed Mode Discs The radio also plays discs that contain both uncompressed CD audio (.CDA files) and MP3/WMA files depending on which slot the disc is loaded into. By default the radio reads only the uncompressed audio (.CDA) and ignores the MP3/WMA files on the DVD deck. On the CD deck, press the CAT (category) button to toggle between compressed and uncompressed audio format, the default being the uncompressed format (.CDA). 3-111