If you already have a decent laptop then rather than go with these you would be better off getting a universal VST such as Kontakt 5 or Halion Sonic as you get a much better quality of sound along with greater flexibility, the only down side is that you have to set up the VST yourself to get it to work with your keyboard, but at least you will be getting a great experience in the process.

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).