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* Chickadee: (chickadee).     Game programming toolkit for Guile.

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<span id="The-Listener"></span><div class="header">
<p>
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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