What everyone else said, plus any indication of noise no derbies , hunt tests, until you believe it is gone! Unfortunately or fortunately some of these noisemakers are excellent markers, don't be tempted. Been there, done that and they can be heartbreakers if noise becomes a big issue. Treating the problem surgically doesn't work, will not elaborate.
I used Hillmann's method on a son of a vocal dog. He has a lot of go but no noise. If you use this method from day 1 until they are a year old, you shouldn't have any issues with noise.
I wouldn't advise running any tests during that time either:-)
I agree with Tammy. Bill Hillman's video is definitely the tool that I would use. Didi is a pup out of my Jefe, who is out of Little Man, who is well know for lots of go. Jefe was and is a vocal dog on the line, lots of noise (though no barking) and has the ability to creep for feet, not inches. Love him to death and his love of training and working, but didn't want the pup to have these issues. Didi is now 16 months old, steady as a rock and no vocal issues whatsover. She hunted a lot with me this year while guiding and was steady, not vocal, and would lay down by me when field hunting. Bill's method works!!!