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  1. B

    help with more physics?

    is it proportional?? if it is,...it would be 5.2.
  2. B

    a yamaha pf 80 piano?

    Only some of the keyboard give a sound when pressed , how might I fix this??
  3. B

    I need help with a yamaha pf 80 piano?

    I played piano two days ago and it was working fine, and then today when I was going to play, only like half of the keyboard makes sounds. I try putting it in different settings, but I don't know how to fix it. Please help.
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