"the default is 25, so values inside a circle with the radius 25 will still count as zero."
Simplified English that is more to the point:
Analog deadzone of 25[default] means values within a circle radius of 25 will be dismissed.
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I'm not convinced your sentence is much clearer ("dismissed" is vague, vs. "count as zero" which is specific; "[default]" is unusual grammar)
Hmm, I guess you are right.
Thanks for the respond Ashley.