ok ok, I'm almost finishing, I have to take the notes of the RightUp and variationsNice, you have the info you need.
Now follow this format to make the .ini:
StickX is the left-right direction on the white stick and CstickX is the left-right direction on the yellow stick.
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Wait I just noticed you can press your joysticks? I guess yours is more than just a usb replica of the original gamecube controller then. If you want to register these buttons, even though the gamecube doesn't have them but nintendont can use them to reset the system, you'd have to add these two lines:
RAnalog=
LAnalog=
Just add them at the end of your .ini.
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this is my controller btwok ok, I'm almost finishing, I have to take the notes of the RightUp and variations