This is the sound of turning on and off a FM radio station that is not tuned in to a legitimate station on a multi-faceted Sony playback system. By using a remote, one can hear the static or lack of clarity in hearing a FM radio station when incorrectly tuned. The sound heard is the static when no station, specifically, is tuned in or set.
stereo system with 3-CD player, tape deck and speakers
FM radio static when not clearly tuned into a station.