IRiver MPlayer User Manual page 20

Chapter3 Using the Mplayer
Music
Playing Music Files
1. Press the [ ] button to play music file.
You will hear a beep with green LED.
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Note
If there is a music file to play when you press the [ ] button, the previous track will be played.
If not, you will hear beeps with 2-second interval.
If there is any error while playing music, the next track will be played after 2 beeps.