Alien Directors cut: The Alien Transmission AKA:SOS/Warning signal

Watching the directors cut on my original Alien Quadrilogy DVD and watching the new Blu-ray box set Alien disc it looks like someone has changed the sound from the distorted backwards sounding Alien talk in the original dvd to a more spacey electrical wavey sound on the new blu-ray. My question to you guys is could Ridley Scott have gone in and replaced the scene's audio with something he wants the Space jockeys voice/sound they make to correspond with the new movie. Please do me a favor and watch both and tell me if they're not the same, I swear they are different and if I'm right it could possibly be a clue to Prometheus. If this has been talked about I'm sorry i'm new here and love the original film.