Communication is huge with us and my (very nearby) neighbors. We had a cayuga that was just too noisy, and we had to rehome her before she was 8 weeks old! I don't know if this is typical of cayugas, since she's the only one I've had, but the friend who got her said she's the noisiest duck she's ever heard. I've heard pekins are super noisy. I have Welsh harlequin hens and blue Swedish drakes. The drakes are super quiet, as drakes are anyway. Even at their loudest, it sounds like they have laryngitis. The ducks were loud at first, but are a lot quieter now that they're laying age. When they were still maturing, they could get a little loud. I called them my watchducks, because they alerted me when women (and men) came down my driveway. My dog doesn't bark at women, so the ducks were my alarm. Now, I really only hear them when they're out of food or water.
A really big thing to keeping them quiet is keeping them happy. When my pond is frozen, they get a little noisy. But if they have the food, water, a little swimming space, and somewhere to camp out, they generally stay quiet.