If the arranger itself is so secondary to those other skills, why change it so often? You make it sound so unimportant, but we all know that it is the thing that Donny spends the most time posting about, obsessing about and changing, so often.

We all know already he's a busy man...

All that time spent converting SMFs, styles and learning a new OS could easily be spent learning new routines, or combing the hat shops for a new hat for the act!
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An arranger is just a tool. What matters is what you build with it..!