CITROËN DS 4 Handbook page 402

Cd, USB
Playing a compilation
Insert an MP3 compilation in the CD
player or connect a memory stick to the
USB port, directly or via an extension
lead.
The system creates playlists (temporary
memory) the creation time for which can take
from a few seconds to several minutes.
The playlists are updated every time the
ignition is switched off or a USB memory stick
is connected.
Play starts automatically after a period which
depends on the capacity of the USB memory
stick.
At a first connection, the order suggested is
by folder. When connecting again, the order
previously chosen is retained.
To play a disc or memory stick which
has already been inserted, press
SOURCE or SRC several times in
succession and select "Cd" or "USB".
Press one of the buttons to select the
next or previous track.
Press one of the buttons to select the
next or previous folder in the order
chosen.
Press and hold one of the buttons for
fast forwards or backwards.
Press LIST to display the menu of
folders in the compilation.
Select a line in the list.
Select a track or a folder.
Up a level in the menu.
Skip a track.