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+The right approach for using MIDI on Linux depends on which version of
+JACK you use. The world divides into:
+
+<dl>
+<dt>Systems using JACK 1, versions 0.124 or later</dt>
+<dd>On these systems, just start JACK with 
+ the <code>-X alsa_midi</code> server argument. To support legacy control
+ applications, you can also use the -X seq argument to the ALSA
+ backend of JACK and get the exact same results.</dd>
+<dt>All others</dt>
+<dd>Use a2jmidid to act as a bridge between ALSA MIDI and JACK. Do
+  not use the -X seq or -X raw arguments - the timing and performance
+  of these options is not acceptable.
+</dd>
+</dl>
+  
+<h2>a2jmidid</h2>
+<p>
+  <dfn>a2jmidid</dfn> is an application that bridges between the system
+  <abbr title="Musical Instrument Digital Interface">MIDI</abbr> ports and
+  <abbr title="JACK Audio Connection Kit">JACK</abbr>.
+</p>
+<p>
+  First you should make sure that there is no ALSA sequencer support enabled
+  in JACK. To do that open QJackCtl's <kbd class="menu">Setup</kbd> window.
+</p>
+<p>
+  Set <kbd class="menu">Settings &gt; MIDI Driver</kbd> to <kbd
+  class="input">none</kbd>.
+  Then uncheck the <kbd class="optoff">Misc &gt; Enable ALSA Sequencer
+  support</kbd> option.<br />
+  Now it's time to restart your jack server before going on.
+</p>
+
+<h3>Check for a2jmidid availability</h3>
+<p>
+  First, check whether a2jmidid is already installed in your system. After
+  starting your JACK server, go to the command line and type
+</p>
+<kbd class="cmd lin">a2jmidid -e</kbd>
+<p>
+  If a2jmidid does not exist, install it with the software manager of your
+  Linux distribution and try again.
+</p>
+
+
+<h2>Check available MIDI ports</h2>
+<p>
+  If you have correctly configured JACK for MIDI, then your MIDI ports should appear in
+  qjackctl under <kbd class="menu">Connections &gt; MIDI </kbd>.
+</p>
+
+<h3>Making it automatic</h3>
+<p>
+Once you've verified that the ports appear in JACK as expected, you
+can make this happen whenever you start JACK.
+</p>
+
+<p>If you use a newer version of JACK 1, just make sure the -X
+alsa_midi or -X seq options are enabled for whatever technique you use
+to start JACK.
+</p>
+
+<p>
+For other versions of JACK,
+add <kbd class="input">a2jmidid -e &amp;</kbd> as an "after start-up" script
+in the <kbd class="menu">Setup &gt; Options</kbd> tab of QJackCtl, so
+that it is started automatically whenever you start JACK.
+</p>
+