Judging by what I've learned, it will go away when I'm actually diving with it... but at the surface and while on the ladder and such, I'm gonna be honking away. Seems a simple thing to design a better solution than to say "they all do that" and just walk away from the issue. It does it at all breathing rates, btw- on the exhale. Inhale is very slight and only at certain rates. Exhale is constant and annoying for $900 bones~ Sounds like a damned rental reg. I'm tempted to go in another direction- but what??? Scubapro? Seems a good choice- anybody have this issue with theirs?