I don't think the breeds matter on the quack... might be a slight difference but that'd be all. My male pekins make a raspy quack can't really explain it. My female mallard makes a "wah wah wah" Like she's laughing, she squeaks to sometimes but I think that just has something to do with her. My ducks make a lot of weird sounds sometimes

. Once your ducks start maturing, drakes will develop and curly "drake feather" at the tail and the females will have straight feathers.
View attachment 1961601Drake <---