@Gryphandor78 I'm struggling with the same issue. I went into mame menu using tab, and set the X+ X- Y+ Y-, the INC and DEC settings, and the trackball worked. I haven't been able to get it working without using mame settings instead of Retroarch. The trackball is a little sloppy dong this, and it has to be done for every game? Is this the way you did it? By moving the trackball in MAME UI to register the positions? Also, did you change any of the sensitivity?
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