Great news! Sort of, lol.
I figured how to make the launch voice appear! The brainiacs among you will have to figure how to expand this. More at the bottom.
I was testing a system I am making and was startled to discover that not only one, but two bases talked to me when I launched! Then I noticed where they were located and it all fell into place.
EW02_01 base (the one I had noticed in vanilla that talked) is located at 1742, 0, 851
My two talking bases (side by side) are located at 1200, 0, -1200 and -1200, 0, -1200
Get it?! The center of the system. I made a test system with four bases and moved them closer and closer to the center as I tested and discovered that ANY base placed within 2200 units of the center of the board will talk. At 2400 units they do not talk.
So, can someone who is smarter than me look through the exe's or dll's and see if you can find this limit and a hex edit that will expand to 200,000 or so?