e</code> is true,
  </p>
  <ul>
    <li>
      the user can drag something to change the instrument's value -- the value is limited by the
      <a>Panel.graduatedMin</a> and <a>Panel.graduatedMax</a> values
    </li>
    <li>
      the user can in-place edit the TextBlock showing the value (if the node is selected, hit the
      F2 key)
    </li>
  </ul>
  <p>
    Of course you can change the details of anything you want to use. You might want to add more
    TextBlocks to show more information. A few prop