Ever done any JR programming before?
I ask because I had issues with switch assignment when I moved to JR from another brand. JR isn't as good as some other brands for this, but the 12X is d*mn close. One of the things they don't seem to mention or at least I never found it, was that in order to change a switch assignment you first have to inhibit the desired switch in the setup menu, then that switch will appear as an option when trying to assign something else.
There are still a few things it won't let you do, but not many....
