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<h2>
<span class="refentrytitle">wguide2</span>
</h2>
<p>wguide2 —
A model of beaten plate consisting of two parallel delay-lines and two first-order lowpass filters.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp53983128"></a>
<h2>Description</h2>
<p>
A model of beaten plate consisting of two parallel delay-lines and two first-order lowpass filters.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp53993336"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>wguide2</strong></span> asig, xfreq1, xfreq2, kcutoff1, kcutoff2, \
kfeedback1, kfeedback2</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp53994576"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- the input of excitation noise
</p>
<p>
<span class="emphasis"><em>xfreq1, xfreq2</em></span> -- the frequency (i.e. the inverse of delay time) Changed to x-rate in Csound version 3.59.
</p>
<p>
<span class="emphasis"><em>kcutoff1, kcutoff2</em></span> -- the filter cutoff frequency in Hz.
</p>
<p>
<span class="emphasis"><em>kfeedback1, kfeedback2</em></span> -- the feedback factor
</p>
<p>
<span class="emphasis"><em>wguide2</em></span> is a model of beaten plate consisting of two parallel delay-lines and two first-order lowpass filters. The two feedback lines are mixed and sent to the delay again each cycle.
</p>
<p>
Implementing waveguide algorithms as opcodes, instead of orc instruments, allows the user to set <span class="emphasis"><em>kr</em></span> different than <span class="emphasis"><em>sr</em></span>, allowing better performance particulary when using real-time.
</p>
<p>
</p>
<div class="mediaobject">
<img src="images/wguide2.png" alt="wguide2." />
<div class="caption">
<p>wguide2.</p>
</div>
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<p>
</p>
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</td>
<th align="left">Note</th>
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<tr>
<td align="left" valign="top">
<p>
As a rule of thumb, to avoid making <span class="emphasis"><em>wguide2</em></span> unstable, the sum of the two feedback values should be below 0.5.
</p>
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<div class="refsect1" title="Examples">
<a id="idp54033240"></a>
<h2>Examples</h2>
<p>
Here is an example of the wguide2 opcode. It uses the file <a class="ulink" href="examples/wguide2.csd" target="_top"><em class="citetitle">wguide2.csd</em></a>.
</p>
<div class="example">
<a id="idp54034224"></a>
<p class="title">
<strong>Example 997. Example of the wguide2 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 RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o wguide2.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">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
aout <span class="opc">diskin2</span> "beats.wav", 1, 0, 1 <span class="comment">;in signal</span>
afreq1 <span class="opc">line</span> 100, p3, 2000
afreq2 <span class="opc">line</span> 1200, p3, p4 <span class="comment">;vary second frequency in the score </span>
kcutoff1 <span class="op">=</span> 3000
kcutoff2 <span class="op">=</span> 1500
kfeedback1 <span class="op">=</span> 0.25 <span class="comment">;the sum of the two feedback</span>
kfeedback2 <span class="op">=</span> 0.25 <span class="comment">;values should not exceed 0.5</span>
asig <span class="opc">wguide2</span> aout, afreq1, afreq2, kcutoff1, kcutoff2, kfeedback1, kfeedback2
asig <span class="opc">dcblock2</span> asig <span class="comment">;get rid of DC</span>
<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 8 1200 <span class="comment">;freqency of afreq2 remains the same</span>
<span class="stamnt">i</span> 1 9 8 100 <span class="comment">;freqency of afreq2 gets lower</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>
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<div class="refsect1" title="See Also">
<a id="idp54036464"></a>
<h2>See Also</h2>
<p>
<a class="link" href="wguide1.html" title="wguide1"><em class="citetitle">wguide1</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp54037512"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>October 1998</td>
</tr>
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<p>
</p>
<p>New in Csound version 3.49</p>
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