+
+<p>
+ Auxes and Subgroups share a common concept — they both provide a way
+ for one or more tracks (or busses) to send their signal to a single bus so
+ that common signal processing can be applied to the mix of their signals.
+</p>
+<p>
+ <dfn>Aux sends</dfn> leave the existing signal routing to the main mix in place,
+ and are typically used to create a separate mix to send to (for example)
+ monitors or headphones (for performer monitor mixes):
+</p>
+<img width="300px" src="/images/aux_routing.png" alt="aux signal routing" />
+<p>
+ <dfn>Subgroups</dfn> usually remove the original signal routing to the main mix and
+ replace it with a new one that delivers the output of the subgroup bus to
+ the main mix instead.
+</p>
+<img width="300px" src="/images/subgroup_routes.png" alt="sub group signal routing" />
+
+