@ Primorge:

Sorry my description was so inconcise... what I had in mind I've attached. The main reason to attach stuff to PoserSurface's Alt_Diffuse (or Alt_Spec) is these channels are more basic... they don't do things with the lights in the scene, unlike Diffuse_Color and Specular_Color.

So, you have better control over your shader.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks