ontal Layout</a>
              <ul class="nav flex-column">
              </ul>
            </li>
            <li class="nav-item" data-level="3"><a href="#example-14-differentiate-the-volume-of-the-two-channels" class="nav-link">Example 14: Differentiate the volume of the two channels</a>
              <ul class="nav flex-column">
              </ul>
            </li>
            <li class="nav-item" data-level="3"><a href="#example-15-having-many-channels" class="nav-link">Example 15: Having many channels