This isn't an arranger, but holy mary mother of crap, if some of the arranger performers here's couldn't find a use for this..., I don't know what else to say.

Check out the video! Click on the first one.
You'll be BLOWN AWAY! You may never look at your keyboards harmonizer the same again.
http://rolandus.com/products/productdetails.aspx?ObjectId=771&ParentId=83
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.