I've been wearing these for 30+ years.  No more.  In spite of the claim of 'authentic original,' they aren't.  My left shoe developed an annoying whistle a day after I started wearing them.  Being a patient man, I decided to wait it out.  Both shoes now whistle.  It appears that they have put some cheap foam between the inner leather and the sole at the high-pressure points - that's what's whistling.  Sperry is obviously aware of this problem, as they've tried to mitigate it by cutting 'vents' in the inner leather.  I'm still trying to figure out how 'original' shoes have this annoying modification.  On the bright side, blind people don't step out in front of me.

Update:
I still don't suggest buying these, but if you have a pair with the 'audio' feature:
I managed to silence mine by temporarily removing the insole and perforating the leather in the floor of the shoe.  The fundamental problem (with mine) is a poorly vented foam region in the 'ball of the foot' part of the insole.  A couple of short (3/8") slices just toe-ward of the insole and I have blessed silence.  YMMV.