manual/_manual/22_using-control-surfaces/02_devices-using-mackielogic-control-protocol/05_working-with-extenders.html

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---
layout: default
title: Working With Extenders
menu_title: Working With Extenders
---
<p>
Extenders will require a custom file as there are no combinations listed
at this time. The best way is to start with the mc.device file and copy it
to a new name such as xt+mc.device and then edit that file. It is best to
name the file with the order the devices are expected to be used in as
the position of the master device is specified in this file.
</p>
<p>
The two lines of interest are:
<p>
<pre>
&lt;Extenders value="0"/&gt;
&lt;MasterPosition value="0"/&gt;
</pre>
<p>
Add these two lines if they are not present. The <code>Extenders</code>
value is the number of extenders used and should not include the master in
that number.
</p>
<p>
When an <code>Extenders</code> value of greater than 0 is used, extra midi
ports will appear for the extenders to be connected to. <code>mackie
control</code> will remain always the leftmost controller. The MIDI ports
for any extra controlers will be named <code>mackie control #2</code> and
up. The numbers will go from left to right.
</p>
<p>
The <code>MasterPosition</code> value is the number of positions from
left to where the master unit (with the master fader) is. So if there are
three surfaces, <code>&lt;MasterPosition value="1"/&gt;</code> will expect
the master on the left, <code>&lt;MasterPosition value="2"/&gt;</code>
would be master in the middle and <code>&lt;MasterPosition
value="3"/&gt;</code> would be master on the right. So the position
matches the port name.
</p>
<p class="note">
The default value of <code>&lt;MasterPosition value="0"/&gt;</code> has
the same effect as <code>&lt;MasterPosition value="1"/&gt;</code>.
</p>
<p>
If the <code>MasterPosition</code> value does not properly match the
physcal position and MIDI port, the master fader and global controls will
not work. The master unit will act like an extender.
</p>