Thanks M.B Doc,

Does all of the control take place in the unit with the thumb wheels located on the side of the seats?

Is there a way to test the system?

It appears to me that the ballons, for lack of a better word, are collasped all of the time until they magically pump up for a while while driving.

Should the ballons react quickly to a change in the thumb wheel setting or is there a time delay before I should expect to feel a change?

sldan