I think you guys are STILL missing the point. Even if you have the chords for an entire tune down and saved (which is pretty unusual unless it's a pretty much ABABAB type structure) you still have control over those changes, just as if you were playing them.

You can build and drop down the energy at will. You can fill or not fill. You can select which variation you want. You can add multipads or not... You can change the entire style (I like to keep several swing styles all next to each other in the style list, so even more variety can be added as the song goes along).

Try doing ANY of that with a sequence!
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An arranger is just a tool. What matters is what you build with it..!