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[ardour-manual-diverged] / _manual / 03_setting-up-your-system / 06_using_more_than_one_audio_device.html

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