btw. Kiai can also be executed silently turning down the volume to whatever level is required as long as the focus is kept on the correct excution.
I can do the count silently or I can murmer it audibly in time to my breathing and movement, but as soon as I start shouting out numbers I can't do anything else. But then that's me. I don't like talking to automated phone machines either and only push the buttons to enter the information