><code>Alternate L-R</code>: Alternates
  <code>Ascend L -&gt; R</code> and <code>Ascend R -&gt; L</code>.</li>
  <li><code>Alternate M-S</code>: Alternates <code>HighOnMid</code> and
  <code>HighOnSide</code>.</li>
  <li><code>Ascend L -&gt; R</code>: Ascend pitch from left to
  right.</li>
  <li><code>Ascend R -&gt; L</code>: Ascend pitch from right to
  left.</li>
  <li><code>HighOnMid</code>: Ascend pitch from side to mid.</li>
  <li><code>HighOnSide</code>: Ascend pitch from mid to side.</li>
  <li><co