I re-tweaked the drum and the bass part of all my MJPlus' smfs when I used them with my MJPro as it uses audio drums and bass. If you don't bother to utilize the audio parts, then you can play all the MJ Plus smfs with the MJPro without problem.
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Jim
SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9