lots of amps invert polarity. some very nice ones in fact.
you are making a big deal of what amounts to nothing to most people. your questions would be better asked on a forum that caters to the recording industry.
i find it hard to believe that you are this concerned with absolute phase and dont have the necessary tools at your disposal to deal with it efficently. there are many elegant solutions, if you have the ability to determine that gear is in and out of phase any of the solutions will be childs play.
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