- for the controllers will be named <code>mackie control #1</code>,
- <code>mackie control #2</code> and up. The numbers will go from left to
- right. That is, from lowest number channel to highest.
+ for the controllers will be named <code>mackie control in/out</code> for
+ the master, <code>mackie control in/out ext #*</code> where * is the
+ position of the extender from left to right. So for a master in the middle
+ with an extender on either side, the ports from left to right will be
+ mackie control in/out ext #1, mackie control in/out and mackie control in/out ext #3.
+</p>
+<p>
+ If using the MCP GUI to connect surfaces the top surface is the leftmost
+ and the bottom is the rightmost. At the time of writing the top is always
+ labeled as the main (master) surface even if the leftmost surface is an
+ extender.