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<div class="refentry" title="wgbow">
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<h2>
<span class="refentrytitle">wgbow</span>
</h2>
<p>wgbow —
Creates a tone similar to a bowed string.
</p>
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<div class="refsect1" title="Description">
<a id="idp53759400"></a>
<h2>Description</h2>
<p>
Audio output is a tone similar to a bowed string, using a physical model developed from Perry Cook, but re-coded for Csound.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp53760296"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>wgbow</strong></span> kamp, kfreq, kpres, krat, kvibf, kvamp, ifn [, iminfreq]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp53761400"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- table of shape of vibrato, usually a sine table, created by a function
</p>
<p>
<span class="emphasis"><em>iminfreq</em></span> (optional) -- lowest frequency at which the instrument will play. If it is omitted it is taken to be the same as the initial <span class="emphasis"><em>kfreq</em></span>. If <span class="emphasis"><em>iminfreq</em></span> is negative, initialization will be skipped.
</p>
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<div class="refsect1" title="Performance">
<a id="idp53763472"></a>
<h2>Performance</h2>
<p>
A note is played on a string-like instrument, with the arguments as below.
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude of note.
</p>
<p>
<span class="emphasis"><em>kfreq</em></span> -- frequency of note played.
</p>
<p>
<span class="emphasis"><em>kpres</em></span> -- a parameter controlling the pressure of the bow on the string. Values should be about 3. The useful range is approximately 1 to 5.
</p>
<p>
<span class="emphasis"><em>krat</em></span> -- the position of the bow along the string. Usual playing is about 0.127236. The suggested range is 0.025 to 0.23.
</p>
<p>
<span class="emphasis"><em>kvibf</em></span> -- frequency of vibrato in Hertz. Suggested range is 0 to 12
</p>
<p>
<span class="emphasis"><em>kvamp</em></span> -- amplitude of the vibrato
</p>
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<div class="refsect1" title="Examples">
<a id="idp53767656"></a>
<h2>Examples</h2>
<p>
Here is an example of the wgbow opcode. It uses the file <a class="ulink" href="examples/wgbow.csd" target="_top"><em class="citetitle">wgbow.csd</em></a>.
</p>
<div class="example">
<a id="idp53768632"></a>
<p class="title">
<strong>Example 988. Example of the wgbow 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 wgbow.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
kpres <span class="op">=</span> p4 <span class="comment">;pressure value</span>
krat <span class="op">=</span> p5 <span class="comment">;position along string</span>
kvibf <span class="op">=</span> 6.12723
kvib <span class="opc">linseg</span> 0, 0.5, 0, 1, 1, p3<span class="op">-</span>0.5, 1 <span class="comment">; amplitude envelope for the vibrato. </span>
kvamp <span class="op">=</span> kvib <span class="op">*</span> 0.01
asig <span class="opc">wgbow</span> .7, 55, kpres, krat, kvibf, kvamp, 1
<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">f</span> 1 0 2048 10 1 <span class="comment">;sine wave</span>
<span class="stamnt">i</span> 1 0 3 3 0.127236
<span class="stamnt">i</span> 1 + 3 5 0.127236
<span class="stamnt">i</span> 1 + 3 5 0.23
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp53770936"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch (after Perry Cook)</td>
</tr>
<tr>
<td>University of Bath, Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
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<p>
</p>
<p>New in Csound version 3.47</p>
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