But the whole point is........... you can do it 'on the fly'.
This isn't something you use (although you CAN) in advance of the performance - it's something you use as you play, either for whole verse/chorus structures, or little improvised 'vamp' sections, whatever you want. Anytime you feel like you'd like to use BOTH hands to make your performance better.
For me........... it's a no-brainer
I WANT IT BACK............
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An arranger is just a tool. What matters is what you build with it..!