Er, grand-mother.
I got a good link thanks to google to fine-tune the sounds that I should be hearing for the traditional type BP apparatus. I can see how these sounds are created, but I'm getting such variability. Of course, I probably have just not got the knack, but our 6M medical BP checks never seemed to take more than a few seconds. After about a minute of careful adjustment, I can't hear for the protestations of the Rivetess. Must try harder.