I have a 3in1 Magic Joy Box myself, and use it with a MacBook Pro. There are a few quirks to this device.
First, and most basic, you must plug the controller into the adaptor before you plug the adaptor into the computer. If you do not, then it still appears as an input device, but there are no actual controls associated with it.
Second, the L and R analog controls don't work on OSX (but see the Code Patches forum on that front if you don't mind doing your own builds).
Third, force feedback doesn't work. As near as I can tell, there is no support for force feedback on OSX in Dolphin, and then there is no OSX driver for the 3in1 Magic Joy Box to enable force feedback in the first place. I plan to keep looking into this as time and motivation allows.
I hope this helps.
First, and most basic, you must plug the controller into the adaptor before you plug the adaptor into the computer. If you do not, then it still appears as an input device, but there are no actual controls associated with it.
Second, the L and R analog controls don't work on OSX (but see the Code Patches forum on that front if you don't mind doing your own builds).
Third, force feedback doesn't work. As near as I can tell, there is no support for force feedback on OSX in Dolphin, and then there is no OSX driver for the 3in1 Magic Joy Box to enable force feedback in the first place. I plan to keep looking into this as time and motivation allows.
I hope this helps.