Question: Which Digital Piano Sound Best (Feels like a real grand acoustic piano) ? Is it Previa by Casio, Kawai Digital, or Clavinova By Yamaha ? or any other ?

Answer: It's a matter of personal preference. (and of course nothing beats a real piano.) But Digital pianos are easier to maintain. I suggest going to the store and playing all these models. I personally like Yamaha. I'd stay away from Casio. Don't know much about Kawai. Kurzweill and Korg have some of the leading technologies as far as sounding like a piano is concerned. You'll want something truly weighted to feel like a grand piano.
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