This issue with the fills confuses me. There must be something absolutely amazing about the Korg's sound for such an obvious (and long talked about) issue to still not be a deal-breaker.
Smooth flowing, natural sounding fills are one of the hallmarks of a good live band, and any volume increase (if there even IS one!) is subtle, at most. But jerky timing... never!
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An arranger is just a tool. What matters is what you build with it..!