I don't think it is possible in P4 becouse highlights don't work with transparency. That is the reason all Poser transmaped hair has textures with painted highlights. But as you noticed, it will look fake in non standard lightnig situations. In P5 I had some sucsess by using the transparency map (or the Texture map)as specularity map (and no texture with painted highlights). But for really good results we would need hait with specialy made specularity maps, in contrast to transparency maps they should have a more or lees uniform density over the whole length of the hair. It is on my very long list of things to try if I find the time. Stefan