Have you tried just typing in the numbers manually? Many times I find turning the dials just too "sluggish", so I end up clicking on the number area and typing in a value.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi