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Katanaswordfish: to map your controllers for emulationstation, just run the input config with your new device. That will add the device to the needed config and allow you to navigate and launch games. (version 2.3)

I’m looking for help here too. I am fully configured for mu 2 usb SNES controllers but want to add NES controller mappings within the emulators. I could use some help configuring the retroarch.cfg file to accept multiple types of controllers that would function as player1 or 2