From what I've read, there's no real guarantee he'll STAY quiet, though. Once he gets well and truly away from our dominant roo (also a Silkie and a very LOUD one), HP may find his 'voice'.
But for now he's living alone in a cage in the garage, murmuring at us as we come and go. We set the cage in the sunshine when we're home, and he's gone for a walk in a harness on a leash. He leads better than he's led... If that makes sense.
He was outside yesterday and Meester (roo) stalked up to the cage looking beligerent. One of the hens squawked from the edge of the woods and Meester ran back to his girls without scaring HP.