I have two girls who didn't make a peep for over 2 weeks that they were at my house They peep back and fourth to each other every now and then, but even now, after 2 months of having them I've only heard them bark twice!
For the most part, chins are fairly quite creatures unless really scared/nervous or really comfortable. Mine have become more vocal now that there is a baby in the chin room, who himself is vocal, but for the most part they're quiet. Verbally, anyway. Their bouncing around and stuff is a whole different story.