Wheel</kbd>: Fine Adjustment X value.</li>
  <li><kbd>Shift</kbd> + <kbd>Middle Drag</kbd>: Only Change Y
  value.</li>
  <li><kbd>Shift</kbd> + <kbd>Mouse Wheel</kbd>: Fine Adjustment Y
  value.</li>
  </ul>
  <h2 id="block-diagram"><a href="#block-diagram" class="header-anchor"
  aria-hidden="true">Block Diagram</a></h2>
  <p>If the image is small, use <kbd>Ctrl</kbd> + <kbd>Mouse Wheel</kbd>
  or “View Image” on right click menu to scale.</p>
  <p>Diagram only shows overview. It’s not exact impleme