find ur own sources 
On my QP you can lower the Nav volume by using the general volume knob WHILE the nav voice is active.jamesaronson said:Does anyone know how to turn up the NAV voice? The radio mutes when the women's voice speaks, but the voice volume is too low. The radio volume control does not assist and I cannot find a switch or control anywhere to turn up the volume.
'04 Coupe - 4000 miles