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I have two generic USB joysticks that feed data to FreePIE, how do I make the rest of the system ignore button presses from those two joysticks?

I remapped the joysticks values in FreePIE but the app (Steam VR) responds to their inputs.

Is there a way to make USB devices only visible to FreePIE?

try:
so clear the different function linked to buttons inside config of the application or game

so only freepie will be used to send command to application

So I found C:\Steam\controller_base\gamepad_generic.vdf

It seems to contain the info I need. However, every time I move or edit the file, Steam regenerates it. Hmmm...