Ah, you found a way.  I was just trying to add one of bill's controllers between the specular and the first color add on the mat.  It didn't work.

EDIT: I think I'm getting close though.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)