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<div class="refentry" title="portk">
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<h2>
<span class="refentrytitle">portk</span>
</h2>
<p>portk —
Applies portamento to a step-valued control signal.
</p>
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<div class="refsect1" title="Description">
<a id="idp36803896"></a>
<h2>Description</h2>
<p>
Applies portamento to a step-valued control signal.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp36804640"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>portk</strong></span> ksig, khtim [, isig]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp36815104"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>isig</em></span> (optional, default=0) -- initial (i.e. previous) value for internal feedback. The default value is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp36816152"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- the output signal at control-rate.
</p>
<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal at control-rate.
</p>
<p>
<span class="emphasis"><em>khtim</em></span> -- half-time of the function in seconds.
</p>
<p>
<span class="emphasis"><em>portk</em></span> is like <a class="link" href="port.html" title="port"><em class="citetitle">port</em></a> except the half-time can be varied at the control rate.
</p>
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<div class="refsect1" title="Examples">
<a id="idp36858296"></a>
<h2>Examples</h2>
<p>
Here is an example of the portk opcode. It uses the file <a class="ulink" href="examples/portk.csd" target="_top"><em class="citetitle">portk.csd</em></a>.
</p>
<div class="example">
<a id="idp36859272"></a>
<p class="title">
<strong>Example 605. Example of the portk 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>
<span class="comment">; Audio out Audio in</span>
-odac <span class="comment">; -iadc ;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o portk.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> 128
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">;Example by Andres Cabrera 2007</span>
<span class="opc">FLpanel</span> "Slider", 650, 140, 50, 50
gkval1, gislider1 <span class="opc">FLslider</span> "Watch me", 0, 127, 0, 5, <span class="op">-</span>1, 580, 30, 25, 20
gkval2, gislider2 <span class="opc">FLslider</span> "Move me", 0, 127, 0, 5, <span class="op">-</span>1, 580, 30, 25, 80
gkhtim, gislider3 <span class="opc">FLslider</span> "khtim", 0.1, 1, 0, 6, <span class="op">-</span>1, 30, 100, 610, 10
<span class="opc">FLpanelEnd</span>
<span class="opc">FLrun</span>
<span class="opc">FLsetVal_i</span> 0.1, gislider3 <span class="comment">;set initial time to 0.1</span>
<span class="oblock">instr</span> 1
kval <span class="opc">portk</span> gkval2, gkhtim <span class="comment">; take the value of slider 2 and apply portamento</span>
<span class="opc">FLsetVal</span> 1, kval, gislider1 <span class="comment">;set the value of slider 1 to kval</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one minute.</span>
<span class="stamnt">i</span> 1 0 60
<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="See Also">
<a id="idp36861560"></a>
<h2>See Also</h2>
<p>
<a class="link" href="areson.html" title="areson"><em class="citetitle">areson</em></a>,
<a class="link" href="aresonk.html" title="aresonk"><em class="citetitle">aresonk</em></a>,
<a class="link" href="atone.html" title="atone"><em class="citetitle">atone</em></a>,
<a class="link" href="atonek.html" title="atonek"><em class="citetitle">atonek</em></a>,
<a class="link" href="port.html" title="port"><em class="citetitle">port</em></a>,
<a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>,
<a class="link" href="resonk.html" title="resonk"><em class="citetitle">resonk</em></a>,
<a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a>,
<a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a>
</p>
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<div class="refsect1" title="Credits">
<a id="idp36866496"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
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<td>Author: Robin Whittle</td>
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<td>Australia</td>
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<td>May 1997</td>
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