As I use X-Plane, the PF3 database is getting less and less up to date. This seemingly can't be fixed, unless someone produces an XP11 equivalent of FSUIPC that has all the functions of Pete Dowson's version. However...
One thing that is theoretically quite possible is to add new callsigns for airlines that have emerged since the PF3 sound files were created - at least some of these would be possible by cutting, copying and pasting existing sound files. However, I recall from some years back that the sound files created in that way are not readable by PF3. I do have some good sound file editing software and wonder if you could explain exactly what the criteria are that make a wav file readable and so usable in PF3. I could then give it a go...
Thanks.