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-Next: <a href="The-Environment.html" accesskey="n" rel="next">The Environment</a>, Previous: <a href="Sources.html" accesskey="p" rel="prev">Sources</a>, Up: <a href="Audio.html" accesskey="u" rel="up">Audio</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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-<hr />
-<span id="The-Listener-1"></span><h4 class="subsection">5.4.3 The Listener</h4>
-
-<p>The listener is a collection of global state that represents the
-player within the 3D sound model. For games that do not need 3D sound
-modeling, manipulating the listener&rsquo;s master volume is the only
-interesting thing to do here.
-</p>
-<dl>
-<dt id="index-listener_002dvolume">Procedure: <strong>listener-volume</strong></dt>
-<dd><p>Return the current master volume of the listener.
-</p></dd></dl>
-
-<dl>
-<dt id="index-listener_002dposition">Procedure: <strong>listener-position</strong></dt>
-<dd><p>Return the current position of the listener.
-</p></dd></dl>
-
-<dl>
-<dt id="index-listener_002dvelocity">Procedure: <strong>listener-velocity</strong></dt>
-<dd><p>Return the current velocity of the listener.
-</p></dd></dl>
-
-<dl>
-<dt id="index-listener_002dorientation">Procedure: <strong>listener-orientation</strong></dt>
-<dd><p>Return the current orientation of the listener.
-</p></dd></dl>
-
-<dl>
-<dt id="index-set_002dlistener_002dvolume_0021">Procedure: <strong>set-listener-volume!</strong> <em>volume</em></dt>
-<dd><p>Set the listener&rsquo;s master volume to <var>volume</var>, a value in the range [0,
-1].
-</p></dd></dl>
-
-<dl>
-<dt id="index-set_002dlistener_002dposition_0021">Procedure: <strong>set-listener-position!</strong> <em>position</em></dt>
-<dd><p>Set the listener&rsquo;s position to the 3D vector <var>position</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-set_002dlistener_002dvelocity_0021">Procedure: <strong>set-listener-velocity!</strong> <em>velocity</em></dt>
-<dd><p>Set the listener&rsquo;s velocity to the 3D vector <var>velocity</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-set_002dlistener_002dorientation_0021">Procedure: <strong>set-listener-orientation!</strong> <em>at up</em></dt>
-<dd><p>Set the listener&rsquo;s orientation to the 3D vectors <var>at</var> and
-<var>up</var>.
-</p></dd></dl>
-
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