Cadillac XLR-V 2006 Owner's Manual page 254

To adjust the tone for each preset, do the following:
1. Press the BAND key.
2. Touch AM, FM1, FM2, XM1, XM2, or WX, if
equipped, to access the desired preset screen.
3. Touch SOUND.
4. Touch the plus (+) or minus (−) signs to adjust
treble, mid-range, and bass.
5. Touch Return to exit. This will take you to the
preset station menu.
6. Touch and hold one of the six preset screen
buttons for more than two seconds until you hear
a beep.
Whenever you touch that preset for less than
two seconds, the station and previously stored
information you have entered for each preset station
will be recalled.
7. Repeat the steps for additional presets.
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Adjusting the Speakers
DSP (Digital Signal Processing): The DSP feature is
used to provide a choice of four different listening
experiences. DSP can be used while listening to the
audio system or the CD player. The audio system can
store separate DSP settings for each source and
preset station, except WX, which is always set to TALK.