Pioneer DMH-ZF8550BT Operation Manual page 47

Hides the touch panel keys.
To display the keys again, touch anywhere on the screen.
Switches between playback and pause.
Skips files forwards or backwards.
Selects the previous folder or the next folder.
Saves the current images as the wallpaper.
Touch the following items to overwrite the image.
[As AV Screen]: Saves the image as the wallpaper for the AV screen.
[As HomeScreen]: Saves the image as the wallpaper for the home menu screen.
[As Both]: Saves the image as the wallpaper for both the AV screen and home
menu screen.
NOTE
If you save the new image, the current wallpaper is overwritten except for the
preset image.
Rotates the displayed picture 90° clockwise.
Sets a repeat play range for all files/the current folder.
Switches between random and normal playback order of the files that are
currently selected for repeat playback.
Switches the following media file types.
[Music]: Audio files
[Video]: Video files
[Photo]: Image files
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