I know what the spreader does, but...how does it do it? What's going on under the covers? Some M/S mojo, or some comb-filtering and panning...I'm curious about this. Also, with such a plugin, what are the ramifications of using it, in terms of phase? I know with some plugins it's incredibly easy to screw up the phase alignment of a track with stereo spreading. Is this one of those too, or is Spreader a bit hardier about that?