I love the sound of 1 second on the Ikoflex RRRRRRRRRzip or the sound of a Contax a simple zip much less noise than a Leica . Hate the sound or more precisely the lack thereof from my Yashicamat I am never sure if I actually took the photo. Love my Koilos shutter click when it opens and clack when it closes but not as hefty a sound as one from the larger copals a simple click and clack. Love those air cylinder shutters. Another very quiet but limited shutter is the clio no cocking necessary no sound when it opens and just a small timid clack when is closes.