Some audio controls can be adjusted at the steering wheel. They include the following:

(Voice Recognition): See "OnStar® Steering Wheel Controls" under OnStar® System or OnStar® System for more information.

SRCE (Source): Press this button to switch between FM1, FM2, AM, or XM1 or XM2 (if equipped), CD, or DVD.

+ - (Volume):  Press this button to increase or to decrease the volume.

+ 1-6 - (Preset Stations): Press this button to play stations that are programmed on the radio preset pushbuttons. The radio will only seek preset stations with a strong signal that are in the selected band. When a CD is playing, press this button to go to the next track.