scales.
  </p>
  <p>
    When an instrument is also a control, the user can modify the instrument's value. When the
    instrument is editable, there may be a handle that the user can drag. This might be the same as
    the indicator or might be a different object.
  </p>
  <p>This sample defines five different types of instruments.</p>

  <ul>
    <li><b>Horizontal</b>, a horizontal scale with a bar indicator and a slider handle</li>
    <li><b>Vertical</b>, a vertical scale with a bar indicator and a slid