No Doc, they simply don't work, well ok they left the few that work in the game and removed the others.
So you don't have the option to order your flight to attack, return to formation, return to base or land, just to name the few that are to me amongst the most useful.
This is all compounded, as you said, by the sound not working properly for a lot of people. And for those who have the sound working the radio messages are, in an attempt to make it more realistic, just unclear and garbled so you always have to read what's being said over the radio.
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