But the hardware for an arranger is just basically the empty shell...
Until the styles and soundset are fixed, I doubt we are going to hear what the PA3X REALLY sounds like. You put T3 styles in a T4, it basically sounds like a T3! Only NEW styles, leveraging the NEW sounds and features is going to tell the full story.
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An arranger is just a tool. What matters is what you build with it..!