ass="memdoc">

<p>Gets the piano roll keyboard width. </p>
<dl><dt><b>Parameters:</b></dt><dd>
  <table class="params">
    <tr><td class="paramname">pr</td><td>a pianoroll previously created with GuidoAR2PianoRoll or GuidoMidi2PianoRoll </td></tr>
    <tr><td class="paramname">height</td><td>the height of the canvas (-1 to set the default height : 512) </td></tr>
    <tr><td class="paramname">keyboardWidth</td><td>the pianoroll keyboard width </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Re