I can't believe how people are making a big deal out of this. Why anyone would care if the reg makes a weird sound at the surface is beyond me. I really think it's unfair to argue that Atomic has made an inferior product because such an insubstantial "problem". Get over it and dive.
UaVaj, first of all, you need to learn how to write in complete sentences.
Secondly, it sounds like you have a different issue with your reg. The honking when breathing IN on a reg is usually a problem with the the first stage. But when exhaling, it will always be the exhaust valve. WHICH HAS ABSOLUTELY NOTHING TO DO with the performance of the reg other than a minor annoyance, which can be avoided by not breathing from the reg at the surface (it wastes precious air anyways).
The rattling in your second stage is most likely due to the demand lever not fully resting on the diaphragm. All this means is your second stage needs to be tuned a bit, or maybe your due for a service.