Thanks for that, Bill. Really going to try to keep my questions to one concept at a time...

Quote - def PM(x, lbl): return Add(x).labelled("PM:" + lbl)
PM makes a parameter node - takes a number and a label.

--Um, this "parameter node" is a math_function (Add) node?
--with all the goodies stubbed in, like what value it's going to accept (x) and "PM:" plus the label?

That init function... that's a new critter for me.
--Are we actually creating a new class, upon which objects can be based?
--So, when defining a class, that init thingie is pretty much required?
--This is not a constructor, just a class definition?
--And you define this class "CSB" as an object-type class with that parameter "object"?

I'll send this first, and puzzle some more over the rest. I like this language the more I see (understand) of it.

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