If you are anywhere near a Wersi dealer (In the USA www.wersimusic.com) have a look at the Ikarus with the OAA, (Open Art Arranger) as it should do everything you require, and you can also use VST Piano instruments. (VSTs can also be used in Styles and Sequences)
Hope this helps

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).