Re: slap or silent in ukemi?
I'm definitely in the silent camp, whether rolling or taking a break-fall. My thinking is that why would you also not want to blend with the floor and adsorb it as opposed to whacking it...
I was talking to a guy from France last year who recounted a tale of a jodo guy in his club with a lot of experience who slipped over going up some stairs and his muscle memory kicked in... two broken hands / arms later and he began to wonder if slapping was such a good idea!
When we get visitors it's nearly always obvious who they study with depending on how they move and fall. Guess it's the same with us mind you.