I have an Audigy ZS 2 sound card.It came from one direction while flying a TBM on the deck in the middle of the ocean.
I have the EXACT issue (and have had for quite some time), except no sound pack in place on the new version. Launch from a base under attack and you can hear that bloody siren for thirty miles. I've gotten so accustomed to it, I couldn't even tell you if it eventually shuts down but I believe it does.Skuzzy pointed a finger at my Turtle Beach Riviera sound card but that's what I have for now.