Yep, I was thinking the same thing about playing it at the Guitar Center. I never noticed it there, either, but it is SO NOISY there, that I bet it wouldn't be able to be heard there anyway. I think that I'll be going back there to see if I can detect it in the store and then see if the salesperson knows anything about it. I also put in an email to Yamaha, but haven't heard anything from them yet.
Thanks for the response!