<p>Oscillator pitch tuning in octave or semitone.</p>
  </dd>
  <dt>Denom. Slope, Rot. Slope, Rot. Offset, Interval</dt>
  <dd>
  <p>Parameters to generate source spectrum for wavetable.</p>
  <ul>
  <li><code>Denom. Slope</code> : Slope of denominator of frequency
  amplitude.</li>
  <li><code>Rot. Slope</code> : Slope of phase rotation.</li>
  <li><code>Rot. Offset</code> : Offset of phase rotation.</li>
  <li><code>Interval</code> : Frequency index interval to write a
  value.</li>
  </ul>
  <p>When <cod