All I ever do is post MemPal questions 
hehe
What LZX modules can make good use of the AUX for Memory Palace? From what I understand the A input is the ARGB incoming to the module. B is a secondary ARGB that can be used to blend and paint over the other.
But if nothing goes into B it is just a blank channel, and A either feeds into itself or just basic Black.
What LZX modules can offer another ARGB input via the backend ribbon cable to use for blending in MemPal?
Memory Palace is super deep. I don’t think that I totally understand your question but I can attempt to give you a couple of pointers. I’m not sure if I understand what you mean by the A and B inputs. I thought we only had one ARGB input and a Media Loader input source.
I don’t believe that there is a backend ribbon cable for inputting a second ARGB input (maybe I have misunderstood what this means).
You can think of the ARGB input as an RGB input and an additional video rate control input, that happens to be named Alpha. It will do different things depending on what it is set up as in the particular mode that the Memory Palace is in.
The the Aux input is the other video rate control input.
You don’t need a specific module to generate ARGB signals to feed to MemPal. You just put an RGB signal into it and then put any shape or mono video signal.