hi hellboy,
i have played my PA1x live with midi files and have not had any issues with the 62 note poly on the Korg..its voice allocation algorithms are very clever and work very well...i have some midi files that are the full 16 tracks and then i play live keyboard over that...i think if you are using samples that are multi velocity and so require several voices to work properly you ahve some poly issues, but if you are using "one shot" drum samples, it should not be a problem..
dennis