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Gary Scavone
2013-09-29 23:38:16 +02:00
committed by Stephen Sinclair
parent 503ed3cc9f
commit e11bff2fe8
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<img src="princeton.gif"> &nbsp; <img src="ccrma.gif"> &nbsp; <img src="mcgill.gif"><P>
<a class="qindex" href="index.html">Home</a> &nbsp; <a class="qindex" href="information.html">Information</a> &nbsp; <a class="qindex" href="classes.html">Classes</a> &nbsp; <a class="qindex" href="download.html">Download</a> &nbsp; <a class="qindex" href="usage.html">Usage</a> &nbsp; <a class="qindex" href="maillist.html">Mail List</a> &nbsp; <a class="qindex" href="system.html">Requirements</a> &nbsp; <a class="qindex" href="links.html">Links</a> &nbsp; <a class="qindex" href="tutorial.html">Tutorial</a></CENTER>
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<h1><a class="anchor" name="instruments">Instruments</a></h1>The ToolKit comes with a wide variety of synthesis algorithms, all of which inherit from the <a class="el" href="classInstrmnt.html">Instrmnt</a> class. In this example, we'll fire up an instance of the <a class="el" href="classBeeThree.html">BeeThree</a> <a class="el" href="classFM.html">FM</a> synthesis class and show how it's frequency can be modified over time.<p>
<pre class="fragment"><div><span class="comment">// bethree.cpp</span>
<div class="fragment"><pre><span class="comment">// bethree.cpp</span>
<span class="preprocessor">#include "BeeThree.h"</span>
<span class="preprocessor">#include "RtWvOut.h"</span>
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<span class="keywordflow">return</span> 0;
}
</div></pre><p>
</pre></div><p>
We have used an <a class="el" href="classInstrmnt.html">Instrmnt</a> pointer when referencing the <a class="el" href="classBeeThree.html">BeeThree</a> instance above, so it would be simple to replace the <a class="el" href="classBeeThree.html">BeeThree</a> class with any other STK instrument class. It should be noted, however, that a few classes do not respond to the setFrequency() function (e.g., <a class="el" href="classShakers.html">Shakers</a>, <a class="el" href="classDrummer.html">Drummer</a>).<p>
The noteOn() function initiates an instrument attack. Instruments which are continuously excited (e.g., <a class="el" href="classClarinet.html">Clarinet</a>, <a class="el" href="classBeeThree.html">BeeThree</a>) will continue to sound until stopped with a noteOff(). Impulsively excited instrument sounds (e.g., <a class="el" href="classPlucked.html">Plucked</a>, <a class="el" href="classWurley.html">Wurley</a>) typically decay within a few seconds time, requiring subsequent noteOn() messages for re-attack.<p>
Instrument parameters can be precisely controlled as demonstrated above. A more flexible approach to instrument control, allowing arbitrary scorefile or realtime updates, is described in the next tutorial chapter.<p>