See also:

Supported Media (Disc Types)
The MP3/WMA file recording media supported by the radio are CDDA, CD-R, CD-RW, MP3,WMA, DVD Video, DVD-R, DVD-RW, DVD+R, DVD+RW, and CDDA+MP3. ...

Commands
The Voice Command system understands two types of commands. Universal commands are available at all times. Local commands are available if the supported radio mode is active. ...

Playback of MP3/WMA Files
When a medium containing MP3/WMA data is loaded, the radio checks all files on the medium. If the medium contains a lot of folders or files, the radio will take more time to start playing the MP3/ ...