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As the CD is playing, you can use the computer's audio settings to adjust the volume of play. This can most easily be accessed via the taskbar; click the Volume icon on the far right to open the needed slider, and adjust the volume as needed. If you cannot hear the audio regardless of volume, the computer may be routing said audio through the wrong output. Select the arrow on the upper right of the slider window, and select "Crestron (Intel(R) Display Audio)".