I’d like to use an external synth module along with my MOXF such that only certain performance/master will initiate a program change to set the patch number on the external module and allow the MOXF to be controller.  In other words Master 01 = use MOXF, Master 2 use slave program 3.
-When I select Master 01, no midi is sent to slave
-When I select Master 02, PC and midi sent to slave.

I’m guessing worst case I could not select any instruments on the MOXF for the patches I want only the slave to use but not sure on sending the program change only for those that are relevant as I dont want PC messages sent each time.

Thoughts on how to accomplish this?

MASTER MODE is how this is accomplished, and the document explaining MASTER MODE on the MOXF can be found Here.

Reading through and studying the document is the first step.  However, you will probably have more questions after doing so.  Let us know.

Thank you very much for the support!