Okay, something was not working. I was not surprised.

I'm going about creating this material in MatMatic:


and, quite astonishingly, I've been able to initialize that initial Diffuse_Value of 1 with the
s = Surface(1,0,0,0)
statement. I was even able to set Highlight_Size to .02 with
s.Highlight_Size = .02

But, bump seems to be a different animal. It didn't seem to allow point-anything as a value. Doing a 
s.Bump = .03
did nothing. Nothing at all. So, I felt really thrilled to be able to do:
s.Bump = Sub(ImageMap(""),.5)
and have it create this:

which was pretty close to what I wanted, but I couldn't seem to be able to set the value of the Bump channel for anything in the world. Until I remembered setting values with the multiply. As in:

s.Bump = Sub(ImageMap(""),.5 * .03

And it worked.

Am I even on the right track here? Feels right, but I've been fooled by this before. From a coding standpoint, I'm going to go LONGHAND until I get the whole functionality sorted, then go shorthand.

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