If you need to know what one of these can do, just listen to this: http://files.keyfax.com/MP3s/motifator2.0/xs/Demo_Funkalicious.mp3

If this doesn't get your juices flowing, no keyboard will! (IMO, YMMV, yada yada yada...)
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An arranger is just a tool. What matters is what you build with it..!