</dd>
  <dt>Feedback</dt>
  <dd>
  <p>Feedback amount of the entire FDN.</p>
  <p>Even if the <code>Feedback</code> is set ot 1, output decays due to
  the linear interpolation used inside of delay.</p>
  </dd>
  <dt>Interp. Rate</dt>
  <dd>
  <p>Rate limiting amount to the change of delay time.</p>
  </dd>
  <dt>Interp. LP [s]</dt>
  <dd>
  <p>Inverse of cutoff frequency of lowpass filter, which is used to
  interpolate delay time.</p>
  <p>On delay time interpolation, the value first goes into lowpass
  f