@Region Philbis,
Not really a howler, like coon hounds or beagles. They are very vocal, but barking is their medium....like German short hairs, weimaraners. They grumble, complain and make tons of noises to let you know when they are unhappy, want attention, happy and they also have an unusual pitiable groan when they don't want you disturbing their nap.
Check out YouTube and type in vizsla dogs, those vidios pretty much describe every vizsla I have ever known. These are high energy dogs and require exercise. God help you if it rains for too long or if snow prevents then from the manic zipping around. They like to bark sometimes while they run around. It's very funny.