My main thing I'll need to see working well is the bellows... Cajun and Zydeco relies a LOT on rhythmical bouncing of the bellows, to get the 'chank-a-chank' that so defines their music.
I've seen a lot of traditional accordion playing on Roland's demos, but little in the Acadian vein...
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An arranger is just a tool. What matters is what you build with it..!