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   <object data="screenshot-1-annotated.png" width="50%"></object>
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+<div class="slide">
+  <h1>Mixer internals</h1>
+  <object data="dvswitch-internal.svg" width="90%" height="90%"></object>
+  <div class="handout">
+    <p>
+      To simplify the diagram, I omitted connection setup, tally light
+      and recording control, and the internal sinks that haven't been
+      implemented yet.
+    </p>
+    <p>
+      All these interfaces have limited-length queues.  If a queue
+      fills up, frames have to be dropped - we must not block or use
+      unlimited memory!
+    </p>
+    <p>
+      The mixer clock thread maintains a frame clock at about 25 or
+      30&nbsp;Hz depending on the video system, constantly adjusted to
+      follow the audio source.
+    </p>
+  </div>
+</div>
+
 </body>
 </html>