speaking of electronics, this is not true at all, given that the scale is linear, not a quasi-logarithmic one. But I do know that some developers use a somewhat different scale. Instead of adding a constant amount in the "volume", giving it a linear sequence (1,3,5,7,9 or something like that) they use a formula that computes the value to be add given the current "volume". This distorts the scale. I can't tell if a system works on either way, but I do know it happens sometimes. The only way to know is dragging it into a lab =D
(I'm a physicist, maybe I do that some day)