Patvers
I have a suggestion to test out your CVP before you give up on it.
Go to the piano voice comparison thread that I gave you the link for, listen to the sample C ( CVP). Use headphones. If you think it sounds like a really bad piano, then I am afraid the CVP is just not to your liking, and that is that.
But if it sounds ok to you then scroll down the thread and you will find the original midi used for the comparison test. Download it to to a USB, take the USB to the CVP and play it. Listen through the same headphones. It should sound about the same as the acoustic version, if not then maybe there is something not right with your CVP or it's settings.
If it sounds about the same, then play it through your speakers. If it does not sound good, then either the equalizer settings are not right for your room, or you just dont like the speakers. Bear in mind though, that no matter how good the speakers, things almost always seem better through good headphones.
if you dont like any of them, you might well have bought the wrong instrument - the CVP is obviously not meeting your expectations, which is bad ( expensive) news.
If they all sound OK though, then the problem is with the playing technique, not the CVP, and you can't buy that.
The test should tell you something, but just for fun, I am putting my money is on the last point - why - think of this, ......if your had a 12 year old granddaughter who had been learning violin for two years and you gave her a Stradivarius, could she produce the same tone as Yehudi Menuhin or Itzhak Perlman?? Of course not. Playing technique matters, and usually much more than the instrument
Mike