to play an audio cd, you must have headphones connected to the headphone jack located on the front of the drive, or connected to the line-out connector located on the back of the system. you must also have an audio software application installed.

    the headphone jack provides the connection for headphones using a 3.5-mm (1/8 inch) stereo mini-plug.

    the volume control adjusts the audio output level for the headphones.