Hi folks- I have just received my new ST1 Atomic- and I stuck it on an old tank to test it out a bit prior to my first dive with my new toy. I have run into this before- and was a little put off to find that the 2nd stage trumpets on exhale... I guess the best way to describe it is that it sounds like a harmonica when I exhale. I unscrewed the cap, checked the diaphragm and all seems well with the assembly. As I said, I've had that happen with a lot of rental regs in the past- but I was really expecting smooth and effortless with this top of the line reg- What's the scoop? Don't worry about it until I've had it to depth? Send it back for one that doesn't "bark"? I guess I should be happy that the Zeagle Octo Z that I received in the same box is smooth and quiet. Sure would like to sort this out. Help!~