Poly pressure = poly AT. Channel pressure is regular mono AT (same AT value for all notes of a particular MIDI channel.
I'm really not sure how it would work over the whole range. As an example: you play initial velocity of 64, so if AT is bipolar, that means AS SOON as you press it, with the lowest values, it would jump DOWN to very low velocities, and it would only return to the original initial velocity when AT value is 64... That doesn't sound right to me.
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