80 lines
3.0 KiB
HTML
80 lines
3.0 KiB
HTML
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<p>
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Ardour will only ever deal with a single <dfn>audio device</dfn>. If you
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want to use more than one, you have two choices:
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</p>
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<ul>
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<li>
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If you want to use Ardour to start JACK (which handles all
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audio I/O) you will need to create a "fake" audio device on your
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computer the represents all the multiple devices you wish to
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use. How to do this is platform dependent and described below.
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</li>
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<li>
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Use a different tool to start JACK and manage all the devices.
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</li>
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</ul>
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<p>
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Ardour is fundamentally designed to be a component in a
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pro-audio/music creation environment. Standard operating practice
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for such setups involves using only a single digital <dfn>sample
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clock</dfn> (something counting off the time between audio samples).
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This means that trying to use multiple independent soundcards is
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problematic, because each soundcard has its own sample clock, running
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independently from the others. Over time, these different clocks
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<dfn>drift</dfn>
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out of sync with each other, which causes glitches in the audio. You
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cannot stop this drift, although in some cases the effects may be
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insignificant enough that some people might not care about them.
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</p>
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<p>
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Thus in an ideal world you should not use multiple independent
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soundcards but instead use a single device with a single clock and all
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the inputs, outputs and other features that you need.
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</p>
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<p>
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Of course, a lot of people don't live in an ideal world, and believe
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that software should make up for this.
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</p>
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<h2>OS X</h2>
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<p>
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In CoreAudio, <dfn>aggregate devices</dfn> provide a method to use
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multiple soundcards as a single device. For example, you can
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aggregate two 8-channel devices so that you can record 16 channels
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into Ardour.
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</p>
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<div class="note">
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<p>
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If you are using a <em>single</em> typical 3rd party
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audio interface (such as those from Apogee, RME, Presonus, and many
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others), <em>or</em> you are using JackPilot or a similar
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application to start JACK, you do not need to worry about this.<br>
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You will need to set up an aggregate device only if either
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of the following conditions are true:
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</p>
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<ul>
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<li>You want to use two entirely separate
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devices <em>and</em> want to start JACK using Ardour.</li>
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<li>You want to use your <dfn>builtin audio device</dfn> <em>and</em>
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want to start JACK using Ardour.</li>
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<li>You want to use more than two entirely separate devices</li>
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</ul>
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</div>
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<p>
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In the case of your builtin audio device, you will need to create
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an aggregate device that combines "Builtin Input" and "Builtin
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Output" into one device.
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</p>
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<p>
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The precise instructions for creating an aggregate device on OS X
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have varied from one released to another. Please read <a href="https://support.apple.com/en-us/HT202000">https://support.apple.com/en-us/HT202000</a>
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</p>
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<h2>Linux</h2>
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<p>
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Please see the instructions at <a href="http://jackaudio.org/faq/"
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title="http://jackaudio.org/faq/">http://jackaudio.org/faq</a>
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</p>
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