Hi Christian,
on my Audya 5 I can assign the style variations to the buttons.
They are listed as "Arr A" to "Arr D".
From "Fill 1" 4 steps back is "Arr D", prior that "Arr C" and so on.
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Greetings from East-Frisia ( Northern-Germany )
Korg PA5X Musikant, Fw. 1.4