Grundig 30GB - Manual (Page 74)

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3.
Pressing the [OSD] button shortly during playing, you can change the
play screen from normal status to
‘Semi-transparent
No display (Display just background
screen) Normal’.
4.
You can change the EQ status by pressing the [OSD] button long during
playing.
You can change the EQ status to
‘NORMAL/ROCK/JAZZ/CLASSIC/POP/U.BASS/U.EQ’.
5.
You can move to the previous song/next song by pushing the jog button
in ◀◀ or ▶▶ direction.
You can move to the previous song by pushing it in ◀◀ direction before 5 sec
after starting playing and to the beginning of the song being played by pushing
it 5 sec later.