Buick RENDEZVOUS NAVIGATION 2004 Owner's Manual page 8

Voice Volume
This system has voice guidance prompts that provide
various messages as you approach points where you
need to maneuver your vehicle, such as an intersection.
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To adjust the volume of the voice prompts you receive
from the system, do the following:
1. Press the menu key.
2. Select Voice Volume.
3. Use the joystick to raise or lower the volume. The
voice prompt will come on with each adjustment to
give you an idea of the volume at each level.
4. Once you have reached the desired volume level,
press the back key to return to the previous screen.
With Adaptive voice volume control, the volume of voice
prompts will increase automatically once the vehicle
exceeds 50 mph (80 km/hr). Select On to activate this
feature.
If you do not need voice guidance, you may also select
Off to turn the prompts off.