our silky roo is quite a little gentleman. He never crows before sunup at all. Our bedroom window is closest to the chicken run and it never wakes me up.
He never crows during the night, and only intermittently crows during the day - a couple of 'hey I'm still the big roo here' and then he's quiet.
We kept him with great trepidation that he would be really annoying, but he is MUCH less loud and constant than your typical yappy dog.