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<h2>
<span class="refentrytitle">wgbow</span>
</h2>
<p>wgbow —
Creates a tone similar to a bowed string.
</p>
</div>
<div class="refsect1">
<a id="idm281472869203784"></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>
</div>
<div class="refsect1">
<a id="idm281472869202232"></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">
<a id="idm281472869199992"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- optional table of shape of vibrato,
defaults to a sine table.
</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>
</div>
<div class="refsect1">
<a id="idm281472869196280"></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>
</div>
<div class="refsect1">
<a id="idm281472869188968"></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="idm281472869187192"></a>
<p class="title">
<strong>Example 1121. 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>
<div class="refsect1">
<a id="idm281472689207304"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o wgbow.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">pres</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;pressure value</span>
k<span class="n">rat</span> <span class="o">=</span> <span class="nb">p5</span> <span class="c1">;position along string</span>
k<span class="n">vibf</span> <span class="o">=</span> <span class="mf">6.12723</span>
k<span class="n">vib</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="o">-</span><span class="mf">0.5</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; amplitude envelope for the vibrato. </span>
k<span class="n">vamp</span> <span class="o">=</span> k<span class="n">vib</span> <span class="o">*</span> <span class="mf">0.01</span>
a<span class="n">sig</span> <span class="nb">wgbow</span> <span class="mf">.7</span><span class="p">,</span> <span class="mi">55</span><span class="p">,</span> k<span class="n">pres</span><span class="p">,</span> k<span class="n">rat</span><span class="p">,</span> k<span class="n">vibf</span><span class="p">,</span> k<span class="n">vamp</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="mi">10</span> <span class="mi">1</span> <span class="c1">;sine wave</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="mi">3</span> <span class="mf">0.127236</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">5</span> <span class="mf">0.127236</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">5</span> <span class="mf">0.23</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472869182968"></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>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.47</p>
<p>ifn optional in version 6.06</p>
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