As you can see I have dials that control the intensity - in this case - from displaces maps, I would like to have a Master dial to control all .what I want to do is to decrease or increase the Master dial and all those who are within them increase or decrease at the same time when I move the Master dial 

It is possible that?

"...One dial to rule them all, One dial to find them,
One dial to bring them all and in the darkness bind them..."