UD: what's testy about what I said? You've been hammering this 'go mono for the sake of PAS' thing over and over for weeks... give it a rest already. The PAS and/or running mono isn't the only convenient way to do a gig. If Bose engineers found that running a stereo Yamaha piano in mono produced phasing cancellation (why ignore that?) and you're willing to live with that - it's your music. But a lot of your generalities like "stereo doesn't MATTER" and "the problem is the sample, not the system" are speculation and nothing more. You're asking for faith, Father Dave of the PAS.