CITROEN C4 Owner's Handbook Manual page 254

04 NAVIGATION - GUIDANCE
Navigation voice synthesis
Adjusting the volume / Deactivation
The volume of messages can be adjusted during the transmission
of the message using the volume adjustment control.
The volume setting of guidance messages is also accessible via
the " SETUP " / " Voice synthesis " menu.
Press NAV to display the
" Navigation - guidance " menu.
Select " Guidance options " and confi rm.
Select " Set speech synthesis " and
confi rm.
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Select the volume graph and confi rm.
Adjust the volume to the desired level
and confi rm.
Select " Deactivate " to deactivate voice messages.
Select " OK " and press the dial to
confi rm.