when I have set up a deadzone it was with using a a program like mameui32 or mameui64. they are mame builds with a frontend in them. I usually selected the game and went to properties and selected controllers. From there you could set the deadzone. if you put this in the same directory as your version of mame the cfg it created for the game would work in your version of mame if they were of the same generation
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Re: Setting an Analog stick dead zone?
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