GMC 2007 Envoy Denali Owner's Manual page 250

Set the volume at the desired level. Press this
button to select LOW, MEDIUM, or HIGH. AVOL
displays. Each higher setting allows for more
volume compensation at faster vehicle speeds.
Then as you drive, automatic volume increases the
volume, as necessary, to overcome noise at any
speed. The volume level should always sound
the same to you as you drive. NONE displays if the
radio cannot determine the vehicle speed. To
turn automatic volume off, press this button until
OFF displays.
Finding a Station
BAND: Press this button to switch between FM1,
FM2, AM, or XM1 or XM2 (if equipped). The
display shows the selection.
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TUNE : Turn this knob to select
radio stations.
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SEEK : Press the right or the left arrow 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 arrow for
more than two seconds. SCAN displays and the
radio produces one beep. The radio goes to a
station, plays for a few seconds, then goes to the
next station. Press either arrow again or one of
the pushbuttons to stop scanning presets.
To scan preset stations, press and hold either
arrow for more than four seconds. PSCN displays
and the radio produces two beeps. The radio
goes to a preset station, plays for a few seconds,
then goes to the next preset station. Press
either arrow again or one of the pushbuttons to
stop scanning presets.
The radio only scans stations with a strong signal
that are in the selected band.