Sensitivity is the scale factor to apply to the analog value. 100% means every OS analog change is sent to MAME. When using a trackball with a mouse encoder, you generally set it to 25% because a mouse counts 4x then the original arcade hardware. Another example is using a 1200 (300 teeth * 4) count spinner to replace the 72 count spinner used in Tempest. 72/1200*100 = 6%
Digital speed is used when you are using digital buttons to simulate the original analog control. This is how many analog values to change every frame. The sensitivity is also applied to this. So you generally set the sensitivity to 100% unless you want fractional increments each frame. eg Speed = 5; Sensitivity = 25% gives 5*0.25 = 1.25 analog change every frame. A special case of Speed = 0 gives 1*Sensitivity analog change per button press.
Centering is used to simulate the auto-centering of a analog device when using digital buttons. This is the speed the analog value returns to center/rest when there is no button pressed during that frame. The analog change being calculated the same way as Digital speed. When set to 0, then no centering is applied.
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Re: What do the analog controls settings equate to?
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