If you want to get the other variation (i.e. A1 to A2) press that variation button again and it will play the other variation. When you press the button again, it'll go back to the previous variation, it'll just cycle back. I love this Ketron feature.
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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