Hi Tharshan
Take a look at the Wersi OAS instruments or a Mediastation and you will find that you will not need a multitude of keyboards, as you can do it all with one.
If you still want the Fingerboard then Wersi does an Expander, so that you don�t need to purchase another keyboard.
Enjoy your dreams

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).