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