We have had some noise, I would say, usually at 30, with 10 or 20 usually fine. Seems we have some noise once in a while on something other than 30, and often 30 is fine. We can always use either 10 or 20 or 30 for low. Only one will be a problem at any one time.
Cathy. Floating Cloud
"Live in the sunshine, swim the sea, drink the wild air.... "