That's an odd one mate. I'm not sure of your speaker setup, but if your running a multi-speaker setup (like 5.1 or 6.1) and you have the game set up for that, then the chatter might be playing on one of the rear channels, which of course a regular headset doesn't have. Try setting IL2 to headset in sounds, and also check your soundcard's settings to make sure that's setup for headset too.
Good luck.
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