Quote: "Sound designer Ben Burtt reveals that Fett made his first live appearance earlier than Empire. According to Burtt, the effects people brought him the costume and asked him to build in a sound effect for personal appearances and such. Burtt designed a "pinging telemetry device sound", which would be the signature sound whenever Fett was in a scene. The sound was mixed in to both films, "but usually it was lost in the music and other sounds," says Burtt, adding that it is most audible in the Empire scene in which Fett is in Slave I pursuing the Millennium Falcon through garbage, and at the end of the new Jabba scene in the Star Wars Special Edition."
So what sound could that be? Is there a sound file somewhere to be found?