When you move the sliders, you might be surprised by some of the interim values that you see. This is based on the way in which the interface objects calculate their output: the objects maintain an internal value from 0 to the range (max – min – 1).
Could anyone kindly tell me what "max – min – 1" mean in this context?
this means that the range is determined by the following equation : max – min – 1 = range
this leads to confusion, because you can set the range, but not the max
so you can get the max : max = min + range + 1