de>Randomize</code> is 0, harmonics of FDN only depends on
  <code>Seed</code> value, and it doesn’t changed by note-on. When
  <code>Randomize</code> is 1, each note-on changes the harmonics of
  FDN.</p>
  </dd>
  <dt>OT +, OT *, OT Offset, OT Modulo, OT Random</dt>
  <dd>
  <p>This group of parameters changes delay times as overtone of note
  pitch.</p>
  <ul>
  <li><code>OT +</code> : Incrementation to previous harmonic
  value.</li>
  <li><code>OT *</code> : Multiplier to previous harmonic value.</li