See also:

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

Controlling The iPod Or External USB Device Using Radio Buttons
To get into the iPod /USB/MP3 control mode and access a connected audio device, either press the “AUX” button on the radio faceplate or press the VR button and say USB or Switch to USB . Once ...

Buttons 1 - 6
These buttons tune the radio to the stations that you commit to pushbutton memory (12 AM and 12 FM stations). ...