@ RobynsVeil:  I would agree with you that there is a lack of in-depth comprehensive tutorials on Material Room shaders available, it is apparent that this is a relatively new concept rapidly catching on in the Poser community.  I believe that the only true way of grasping it's full potential is to experiment with it and document your results.  As a researcher in the scientific community, I understand how tedious that could be.  And although you would like a tutorial that would simply tell you when to do this or that, there may be multiple avenues to achieve the same end result.  BB has opened our eyes to the vast potential of working with shaders, but, unfortunately, many of us will never reach the level of mathematical understanding he naturally possesses.  Again, experimentation and persistance will help in understanding this concept, as well as the need to provide documented tutorials on your hard work.