I have the same issue with my mic which is a usb turtle beach headset. I messed around with every setting I could think of and could not find a way to have the mic work in game. I borrowed a friend's headset same issue as well. I just kinda came to the conclusion that OA does not like usb mics. My solution was purchasing a cheap mic from the dollar store to plug in to my front mic port. Defiantly not the best quality but hey it works and only cost me a dollar plus tax.
Microphone Issue
in ARMA 2 & OA - TROUBLESHOOTING
Posted
I have the same issue with my mic which is a usb turtle beach headset. I messed around with every setting I could think of and could not find a way to have the mic work in game. I borrowed a friend's headset same issue as well. I just kinda came to the conclusion that OA does not like usb mics. My solution was purchasing a cheap mic from the dollar store to plug in to my front mic port. Defiantly not the best quality but hey it works and only cost me a dollar plus tax.