Basically, just search for the USB game controller set up and click "properties." Press all your buttons and see what does what. Then go the JoyToKey program and map the buttons to what the Undertale controls are. It seems ass backwards at first, but I basically use it for everything.
For example, instead of using a program to get my PS3 or 360 controller to work with emulators I just set up keyboard controls for an emulator and then use JoyToKey to match whatever keys I set up.






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