</a>
              <ul class="nav flex-column">
              </ul>
            </li>
              </ul>
            </li>
            <li class="nav-item" data-level="2"><a href="#part-2-delays-and-feedbacks" class="nav-link">Part 2: Delays and Feedbacks</a>
              <ul class="nav flex-column">
            <li class="nav-item" data-level="3"><a href="#example-1-monophonic-delay-of-1-second" class="nav-link">Example 1: Monophonic delay of 1 second</a>
              <ul class="nav flex-column">
      