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My new AT400 "whistles" while breathing normally. I moved the two adjustments to all different configurations and while it breathes differently, it still whistles. When I was swimming hard and drawing more air it doesn't do it. Just when breathing slow and easy. Thoughts???

Most bottles I've found have been "random finds" and not associated with any wreck. This is because people drank what was in the bottle and then simply threw it overboard...