ode> is the most smooth among
  all 3.</p>
  </dd>
  <dt>Sync.</dt>
  <dd>
  <p>When checked, it enables tempo synchronization (tempo sync). LFO
  phase also synchronize to the exact position derived from sync
  interval, and time passed from the start of playback.</p>
  <p>When not checked, LFO behaves as same as if synchronizing to 120
  BPM. It also disables LFO phase sync.</p>
  </dd>
  <dt>Tempo Upper</dt>
  <dd>
  <p>Numerator of sync interval.</p>
  <p>LFO synchronizes to 1 bar when
  <code>(Tempo Up