Chevrolet 2007 Optra Owner's Manual page 197

All of the CD functions work the same while
playing an MP3/WMA, except for those listed here.
See "Playing a CD" earlier for more information.
SCROLL (MP3/WMA Mode Only): Press
the SOUND button for longer than two seconds.
The song title or other available information
of a song scrolls on/off. The offset is scroll on.
The scroll mode can be changed only when
the SOUND button is pressed for longer than
two seconds.
DIR (Directory): Press this button to repeat the
tracks in the current directory. DIR displays.
Press this button again to repeat the tracks in all
of the directories. ALL displays.
Press this button again to turn off repeat play.
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SEEK (Previous/Next Folder)
(in MP3/WMA Mode): Press the up or down
arrows to change the folder. If CD-R does not have
any folder, "ROOT" flashes on the display for a
short time.
( )
TUNE (Previous/Next Track): Press the
down arrows to go to the start of the current
track or press the up arrows to go to the next track.
The track number displays. The player continues
moving backward or forward through the CD
with each press of the up or down arrows.
INFO/DISP (Information/Display): Press this
button to display additional text information related
to the current MP3/WMA song. A choice of
additional information such as: Song Title, Album
Title, and Artist. Bit rate might also display.
When information is not available, No Info
(information) displays.
Press this button for longer than two seconds to
change display mode.
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