CITROËN DS4 Owner's Handbook Manual page 312

04 NAVIGATION - GUIDANCE
ADJUSTING THE GUIDANCE SPEECH SYNTHESIS
ADJUSTING THE VOLUME/DEACTIVATION
The volume of messages can be adjusted during the transmission
of the message using the volume adjustment control.
1
Press NAV to display the
" Navigation - guidance " menu.
2
Select " Guidance options " and confi rm.
3
Select " Set speech synthesis " and
confi rm.
310
The volume setting of guidance messages is also accessible via the
" SETUP "/" Voice synthesis " menu.
4
Select the volume graph and confi rm.
5
Adjust the volume to the desired level
and confi rm.
Select " Deactivate " to deactivate voice messages.
6
Select " OK " and press the dial to
confi rm.