Grundig 30GB - Manual (Page 51)

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3.
If you press the jog button in ◀◀ or ▶▶ direction during playing, you
can move to the previous file/next file.
You can move to the previous file by pushing it in ◀◀ direction before 5 sec
after starting playing and to the beginning of the file being played by pushing it
5 sec later.
4.
You can search the file being played by pushing the jog button long in ◀◀
or ▶▶ direction.
5.
You can hide the icons and captions displayed on the screen by pressing
the [OSD] button shortly during playing.
Whenever you press the [OSD] button, the status changes in the order of ‘Hide
icon
Hide icon/caption Show icon/caption(initial status)’.