Guys, I came across this little beauty last week, "Ground Services Soundpack v2".
It replaces the default sounds of GSX with more realistic voices in my opinion. It works with both version of GSX and the best part…..IT'S FREE!
Have a look here to see if you like it (you will)
https://www.youtube.com/watch?v=bg5NZjo4lYwTo download go here
https://www.aviationlads.com/download/g ... pack-v2-0/