/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">enabled</td><td>a boolean corresponding to the keyboard draw state </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>a Guido error code </dd></dl>

</div>
</div>
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