@SpudsMcToole And I know that it works, I just wanted to help you solving the puzzle in retrospective. 🔍🙂
In the end, I connected a mouse to play Arkanoid in lr-mame2003, and it worked from the off. Xbox 360 controller just too baggy and too huge a deadzone to make it playable. Thanks for advice though.
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Thx for this idea/tutorial ^^