Hummer 2007 H2 Owner's Manual page 245

AUTO VOL (Automatic Volume): With automatic
volume, the audio system adjusts automatically
to make up for road and wind noise as you drive
by increasing the volume as vehicle speed
increases.
Set the volume at the desired level. Press this
button to select LOW, MEDIUM, or HIGH. AVOL
(automatic volume) displays. Each higher
setting provides more volume compensation at
faster vehicle speeds. To turn automatic volume
off, press this button until AVOL OFF displays.
Finding a Station
BAND: Press this button to switch between FM1,
FM2, AM, or XM1 or XM2 (if equipped). The
selection displays.
TUNE: Turn this knob to select radio stations.
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SEEK : Press either the SEEK or the TYPE
arrows to go to the next or to the previous
station and stay there.
The radio only seeks stations with a strong signal
that are in the selected band.
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SCAN : Press and hold either the SCAN or
the TYPE arrows for two seconds until SCAN
displays and a beep sounds. The radio goes to a
station, plays for a few seconds, then goes to
the next station. Press either the SCAN or
the TYPE arrows again to stop scanning.
To scan preset stations, press and hold either
the SCAN or the TYPE arrows for more than
four seconds. PSCN displays and a double beep
sounds. The radio goes to a preset station,
plays for a few seconds, then goes to the next
preset station. Press either the SCAN or the TYPE
arrows again to stop scanning presets.
The radio only scans stations with a strong signal
that are in the selected band.
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