Acura 2007 RDX Owner's Manual page 214

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Table of Contents
Audio System
EMPTY POSITION
You can load a CD into an empty
position while a CD is playing. Press
the AUDIO button to view the audio
control display. Select the empty
position (''No Disc'' is shown on the
audio control display) by rotating the
interface dial. Then press ENTER on
the selector to enter your selection.
The current CD stops playing and
starts the loading sequence. The CD
just loaded will play.
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You can also select the empty
position by pressing the appropriate
preset button.
You can load a disc(s) in any mode
(AM, FM, XM radio, or AUX) if you
do not select an empty position.
You cannot select the empty position
if there is no disc in the changer.