Try grouping your 3 ATC voices into folders named 1, 2, and 3 under ATC. I’m betting the behavior would be as each ATC is contacted from base to base, the voices will automatically cycle based on the order they are set up in the ME. A simple test mission can check this “theory”.
I agree on culling the callsign list. I slapped those 90 together to stick something on the wall and to find out how the ME would behave with such a large number. I think 3-5 new voices for ATC, JTAC, AWACS and Tankers is sufficienct for beta 1.0. I’d also like to limit the callsigns to 1-2 per aircraft type for BLUE forces initially.
I believe that many DCS users, whether SP or MP, will desire their own custom callsign lists. That is beyond the scope of what we need at this time. However, we will provide them with a good foundation to pursue further development either jointly or for their own personal requirements.