This is where Midi (If properly implemented) and VST integration comes in, as you keep your existing keyboard (With its OS and layout that you are used too) and then add the additional voices and features as required. (Quite frankly this should have been implemented as standard on arrangers a long time ago)

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).