+<p>
+ Adding a plugin will not modify the signal flow. The number of plugin outputs
+ is forced to the number of inputs present at the point of insertion. If a
+ plugin pin is missing, it is ignored. If a plugin pin is not connected, it is
+ fed with silence. Non-connected plugin outputs are ignored.
+</p>
+
+<p>
+ Strict I/O enforces the number of output ports. The number of inputs to the
+ panner (outputs of last plugin) defines the number of track outputs (after
+ panner). Required ports are automatically added, excess ports are removed.
+ The user cannot manually add or remove output ports.
+</p>
+
+<p>
+ Strict I/O is set when creating the track and can later be enabled or
+ disabled dynamically in the context menu of every mixer strip.
+</p>
+
+<figure class="center">
+<img src="/images/strict_io_routing.png" alt="strict I/O routing" />
+<figcaption class=center>Flexible vs. Strict I/O.</figcaption>
+</figure>
+
+<p>
+ There are two exceptions to the above rule:
+</p>