As of now there is no way of checking the sound of our microphone in Arma. I think it's essential to have a microphone test in the parameters to know if other players hear us well, if there is no white noise etc...
I recently discovered that there is a lot of background noise from my microphone by talking into a radio configured twice on the same channel. I had no way of knowing prior to that test. Would help players who have bad microphones diagnose their sound quality too.
Thanks.