On a related note, I also have a problem with Roland's on a similar issue. Although the D-Beam offers Fill-UP or Fill-DOWN as options, it can only do ONE of those.

But the FC-7, while you can select each Variation individually (with Auto Fill ON), Fill-UP and Fill-Down are not offered. Which seems a FAR better place for that pair of commands!

If you need more commands on the FC-7 than the three that are left over once you have set up Var 1-4, a simple pair of Fill-UP and Fill-DOWN allows you to get through ALL the variations easily, and frees up two more slots. All you need to do more than one move is a double tap to go down two Var, or a triple for three.
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An arranger is just a tool. What matters is what you build with it..!