plott hounds ?

wehave three that are silent on track one came from orville roberts line and he psoitively will not say anything the other is a dog that we got from a line of dogs where the guys who bred and hunted these dogs bred dogs who started off barking on track but went completly silent later on in life he will still give some mouth from time to time but not the barking every breath kind of open, and mine is a half english half plott that onlys barks if he is trashing other thatn if he is on a hog he isnt saying nothing, i love a good silent mouth hound but in my experience they brak more bays unitl they get one or two good wreckings under their collar then they learn how to bay