You can add USB controllers on the recalbox.Most models are compatible, see the compatibility list.After plugging your USB controller or pairing your Bluetooth controller, press START with an already configured controller (or ENTER on the keyboard) and select "CONFIGURE INPUTS".Then follow instructions.The last button, the HOTKEY is a button that will activate buttons combination (see Special Commands). For Xbox 360 and PS3 controllers, the default hotkey button is HOME or PS. It is recommended to use L3 (joystick click on Dualshock) or SELECTButtons assignment is based on the Super Nintendo controller :The L and R buttons (with L2 R2 L3 R3) are based on the Playstation controllers.Pass the buttons you don't have by pressing any button for 2 seconds.Back on the configuration screen, you can assign the controller to a player. Your controller is now configured!