Hummer 2004 H2 User Manual page 47

AVC (Automatic Volume Control): If your system has
AVC, your audio system monitors the noise in the
vehicle. Then, AVC automatically adjusts the volume
level so that it always sounds the same to you. To use
AVC, use the joystick to select on, to turn it off,
select off.
From the Audio Menu, you may be able to use the right
side hard keys to choose from four different equalization
settings if your system has these:
Normal: This setting enhances the stereo effect.
Driver: This setting gives the driver the best sound
quality.
Rear: This setting gives the rear seat passengers the
best sound quality.
Spacious: This setting makes the listening space
seem larger.
Speed Compensated Volume (SCV): If your system
has SCV, your audio system adjusts automatically
to make up for road and wind noise as you drive. Set
the volume at the desired level. Then, as you drive, SCV
automatically increases the volume, as necessary, to
overcome noise at any speed. The volume level should
always sound the same to you as you drive.
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