  </dd>
  <dt>Shape</dt>
  <dd>
  <p>LFO distortion amount.</p>
  <p>The wave shape becomes close to square wave when <code>Shape</code>
  is set to rightmost.</p>
  </dd>
  <dt>Retrigger</dt>
  <dd>
  <p>When checked, it resets LFO phase to 0 for each note-on.</p>
  </dd>
  <dt>Sync.</dt>
  <dd>
  <p>When checked, it enables tempo synchronization.</p>
  </dd>
  <dt>Sync. Upper, Sync. Lower</dt>
  <dd>
  <p>These are the numbers on the right side of <code>Sync.</code>
  checkbox. They indicates the interval