If you look at most of the top arranger players (Including John Beasley) they have one thing in common, in that they all started out playing organ and/or synthesisers so they can arrange and play the tunes without any automatic backing, thus it makes it easy for them to set up arranger backing (Or design styles) as they know how to make it sound good. (Remember the arranger came from the easy play features of organs which were designed to make anybody sound great without the wait) You will also find that many of these players when they are not demonstrating for a manufacture add in a pedalboard and a lower keyboard for more flexibility. (It also makes it easier to play on the fly and allow them to play most tunes when people ask, as they don’t have to look for a style as they play it themselves with just drums, and use instruments that suit at the time)
As always, it’s the player that makes the sound, not the instrument, which unfortunately is not as it was, as when organs were around (Arrangers where just toys at that time) you could tell who was playing by just hearing their playing style, but these days with arrangers, you just hear the arranger keyboard manufacture. (If you want to stand out, learn to play everything yourself (No backing except drums) and when you then go back to using an arranger the magic will occur)

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).