<dl>
  <dt>Smooth</dt>
  <dd>
  <p>Time length to change some parameter value to current one. Unit is
  in second.</p>
  <p>List of parameters related to <code>Smooth</code>. <code>*</code>
  represents wild card.</p>
  <ul>
  <li>All parameters in Tuning section.</li>
  <li>Gain
  <ul>
  <li><code>S</code></li>
  <li><code>Gain</code></li>
  </ul></li>
  <li>Lowpass
  <ul>
  <li><code>Cutoff</code></li>
  <li><code>KeyFollow</code></li>
  <li><code>S</code></li>
  <li><code>Amount</code></li>
  </ul></li>
