Got to give the nod to Yamaha on this one.. T3 if you can afford it, S900 if not.

Mind you, I don't know if pitch can be assigned to a pedal on an S900... anyone?

Yamaha's Mega Voice technology, in the style parts themselves, makes the rhythm electric guitars sound SO good. It's the #1 thing from Yamaha's (even more than the SA voices) that I most envy...
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An arranger is just a tool. What matters is what you build with it..!