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PS2 controllers send a 1-byte value from -128 to 127. It's unclear exactly where the center is. I've seen claims it's exactly 0, claims it's exactly -1, and claims its in between. It might even depend on the game. I've tried all 3 and haven't noticed any difference. I'm currently using 0 because that's what the other pad plugins use.
Edit: Part of the problem could be I just use an integer cast to round, and it rounds positive and negative numbers slightly differently, I believe.
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