There is a sound file that only goes off while I'm in flight and it masks comms with ATC and it makes no sense but I can't find it to save my life...it sounds something like this:"All set? (garbled) Angeli, three two one, go" in a British accentI've gone through every sound file I have but can't find it...anyone know what this is?

Sounds like the SSTSIM Concorde.