X button

[Koto1]

Hello,
I'm trying to make a controller using this library with an Arduino Leonardo and it's going well I managed to connect it to the switch and press buttons and all but when I looked at the button list I noticed that the x button is missing from there.
I tried a few things but I'm new to coding and electronics so I don't really know what to do now so I would really appreciate it if you could help me with that.
thanks :)

[kjmclaws]

Where the code says Z on the buttons that's really X.