 Cutoff</code> is set to 0, <code>Q</code> is set to
  maximum, and <code>LP Key</code> is set to 1, the oscillator outputs
  sine wave.</p>
  </dd>
  <dt>Density [Hz]</dt>
  <dd>
  <p>Density of noise and pulse train.</p>
  <p>To match the tuning to FDN, set the value of <code>Density</code>
  to the same value of <code>Tuning-&gt;A4</code>, then set
  <code>Density key</code> to 1.</p>
  </dd>
  <dt>Density Key</dt>
  <dd>
  <p>Key follow amount to <code>Density</code>.</p>
  </dd>
  <dt>Noise Decay</dt>
