Samsung GT-I8510/8 Quick Start Manual page 28

Listen to music
5. Use the following during playback:
Key Function
Pause or resume playback
Confirm
Navigation
Stop playback
(Down)
Restart playback; Skip
Navigation
backward (press within 3
(Left)
seconds); Scan backward
(press and hold)
Skip forward; Scan forward
Navigation
(press and hold)
(Right)
Adjust the volume up or down
Volume
28