I heard the whooshing very clearly with sidetone enabled. Switched it off and it was gone.
As I mentioned a while ago the mute button does absolutely nothing when I'm using wireless, still don't know if that's how it's supposed to be or if there's a problem with my headset? It works when I connect through USB (or at least I see in Audeze HQ that it's muted then). I've done complete gaming sessions with the button in mute position but they all heard me perfectly clear
What I'm trying to say is that the mute may not actually mute if on wireless, meaning the enabled sidetone is probably the cause of the whooshing sound?