Ford 2006 Expedition Owner's Manual page 54

Entertainment Systems
To adjust the navigation voice output level, adjust the volume control
only when the navigation system is speaking. Otherwise, it will adjust the
radio levels.
Automatic volume control (AVC)
With this feature, radio volume changes automatically with vehicle speed
to compensate for road and wind noise. To engage the AVC feature:
1. Press the MENU control.
M E N U
2. Select AUDIO OPTIONS.
3. Select AVC, TRAFFIC, DSP.
4. Select AVC.
5. Use the cursor control to increase
or decrease the levels. The higher
the level selected, the greater the
compensation. The levels will be
shown in the display. Decrease all
the way to the left to turn AVC off.
AM/FM select
The AM/FM control works in radio,
CD and navigation modes.
A M / F M
54
2006 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)