I did not know about that guidance. That LK is a fraction of K, and LLK is a fraction of LK (but reflected back in terms of K) . I have made curves from scratch and have not noticed any strange effects of LK and LLK being fraction of K. Mind you, most times I just modify existing curves. If input->output is a linear relationship, it is mathematically the same to use either method. But we know the relationship is not linear. I have to think about this. I may putz around and see what difference (visual smoothness of ramp, and amount of linearization would be needed) the 2 methods yield.
