BTW, there already IS a perfect arranger for everybody; it's called YOUR BRAIN. You just have to figure out which 'buttons' to push, which 'sliders' to slide, and which knobs to twist.
Just another opinion.
chas
DITTO!
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)