CITROËN C3 PICASSO Handbook page 220

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 confirm.
Select "Set speech synthesis" and
confirm.
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Select the volume graph and confirm.
Adjust the volume to the desired level
and confirm.
Select "Deactivate" to deactivate voice messages.
Select "OK" and press the dial to
confirm.