Actually hammer, it occurred to me that you should check the OTS filter settings to stop it changing the split mode. I'll just check it and report back.
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Roland G-70, FP-4, BK-7m, SonicCell, KC-350 x 2, DS-5 x 2, A300-Pro, Sonar X1 PE, BR1600CD
Yamaha HX-1 System 1, KA-20x2