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<div class="refentry" title="rezzy">
<a id="rezzy"></a>
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<a id="IndexRezzy" class="indexterm"></a>
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<h2>
<span class="refentrytitle">rezzy</span>
</h2>
<p>rezzy —
A resonant low-pass filter.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp40886616"></a>
<h2>Description</h2>
<p>
A resonant low-pass filter.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp40887240"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>rezzy</strong></span> asig, xfco, xres [, imode, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp40888352"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imode</em></span> (optional, default=0) -- high-pass or low-pass mode. If zero, <span class="emphasis"><em>rezzy</em></span> is low-pass. If not zero, <span class="emphasis"><em>rezzy</em></span> is high-pass. Default value is 0. (New in Csound version 3.50)
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- if non zero
skip the initialisation of the filter. (New in Csound version
4.23f13 and 5.0)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp40926328"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>xfco</em></span> -- filter cut-off frequency in Hz. As of version 3.50, may i-,k-, or a-rate.
</p>
<p>
<span class="emphasis"><em>xres</em></span> -- amount of resonance. Values of 1 to 100 are typical. Resonance should be one or greater. As of version 3.50, may a-rate, i-rate, or k-rate.
</p>
<p>
<span class="emphasis"><em>rezzy</em></span> is a resonant low-pass filter created empirically by Hans Mikelson.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp40928712"></a>
<h2>Examples</h2>
<p>
Here is an example of the rezzy opcode. It uses the file <a class="ulink" href="examples/rezzy.csd" target="_top"><em class="citetitle">rezzy.csd</em></a>.
</p>
<div class="example">
<a id="idp40929656"></a>
<p class="title">
<strong>Example 724. Example of the rezzy opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o rezzy.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
asaw <span class="opc">vco2</span> .3, 110 <span class="comment">;sawtooth</span>
kcf <span class="opc">line</span> 1760, p3, 220 <span class="comment">;vary cut-off frequency from 220 to 1280 Hz</span>
kres <span class="op">=</span> p4 <span class="comment">;vary resonance too </span>
ares <span class="opc">rezzy</span> asaw, kcf, kres
asig <span class="opc">balance</span> ares, asaw
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 4 10
<span class="stamnt">i</span> 1 + 4 30
<span class="stamnt">i</span> 1 + 4 120 <span class="comment">;lots of resonance</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp40931928"></a>
<h2>See Also</h2>
<p>
<a class="link" href="biquad.html" title="biquad"><em class="citetitle">biquad</em></a>,
<a class="link" href="moogvcf.html" title="moogvcf"><em class="citetitle">moogvcf</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp40933424"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Hans Mikelson</td>
</tr>
<tr>
<td>October 1998</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.49</p>
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