Thanks Brad, Your expertise if much appreciated. You've been amazingly prompt and helpful many times in the past.
What I'm seeing is if I'm in any stage setting and make a change to the behavior of pedal 1 ( Haven'd tried pedal 2 ), those changed parameters are then present in every other stage setting in my PX 5S. It doesn't work like that with sliders and knobs. Their settings seem to be localized to only the current stage setting. Settings for the pedal, however, seem to be global in that they affect all stage settings.
In my synth patch, I set pedal 1 to toggle portamento. Then I tried a couple pianos and found the pedal was trying to toggle portamento there also. In one of the piano stage settings, I then set pedal 1 back to "hold". When I went back to my synth stage setting I found pedal 1 was no longer toggling portamento, it was now doing "hold". Am I missing a setting that would localize the function of pedal 1 to only the current stage setting?