The electronics inside the terminal pick up specific shortwave sounds live: Morse code, radio, telex and atmosheric noises. Five loudspeakers play these sounds back with a little time delay.
Every loudspeaker filters only a certain type of sound and kind of information. The information, the news, pauses and radio noises create a unique sound- and informationscape which changes all the time, depending what rules the airwaves, the ether.