But it has also a button with a led indicating when the analogues are on or off, I tried both options, but none work, strange that when I used the ps3 sixaxis the analogues used to work, altough had some bugs, anyway I will change the usb gamepad for one without analogues, I bought it on Monday.
Update: Actually I am not 100 sure, maybe I'm confusing with the Mupen64Plus emulator, that I know for sure supports the ps3 analogues.