Yeah - use the alpha map as a grayscale to multiply the specular intensity. Use 50% gray as your base and then go black or white depending on the power you want. Unfortunately there isn't a way to control spec. fresnel and spec. sharpness independently.
Yes, I am talking about marmoset. Yes, there are three sliders. However, when you want to control spec over a single shader on a single mesh, so that spec is more powerful in one place than another, the only 'map' which you can use is a specular power map. You'll have to adjust the fresnel and the sharpness sliders best…
Cheers guys. This is showcase in Marmoset using the "Sunlight" preset at 0.56 brightness and then placing an additional 3 lights into the scene. I agree, it could do with a bit of dirtying up. At the minute its just using a single specular power over the whole model. Do you know if its possible to control the gloss in…