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<div class="refentry" title="zamod">
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<h2>
<span class="refentrytitle">zamod</span>
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<p>zamod —
Modulates one a-rate signal by a second one.
</p>
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<div class="refsect1" title="Description">
<a id="idp54597864"></a>
<h2>Description</h2>
<p>
Modulates one a-rate signal by a second one.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp54598592"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>zamod</strong></span> asig, kzamod</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp54638352"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- the input signal
</p>
<p>
<span class="emphasis"><em>kzamod</em></span> -- controls which za variable is used for modulation. A positive value means additive modulation, a negative value means multiplicative modulation. A value of 0 means no change to <span class="emphasis"><em>asig</em></span>.
</p>
<p>
<span class="emphasis"><em>zamod</em></span> modulates one a-rate signal by a second one, which comes from a za variable. The location of the modulating variable is controlled by the i-rate or k-rate variable <span class="emphasis"><em>kzamod</em></span>. This is the a-rate version of <a class="link" href="zkmod.html" title="zkmod"><em class="citetitle">zkmod</em></a>.
</p>
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<div class="refsect1" title="Examples">
<a id="idp54641392"></a>
<h2>Examples</h2>
<p>
Here is an example of the zamod opcode. It uses the file <a class="ulink" href="examples/zamod.csd" target="_top"><em class="citetitle">zamod.csd</em></a>.
</p>
<div class="example">
<a id="idp54642368"></a>
<p class="title">
<strong>Example 1010. Example of the zamod 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 No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o zamod.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Initialize the ZAK space.</span>
<span class="comment">; Create 2 a-rate variables and 2 k-rate variables.</span>
<span class="opc">zakinit</span> 2, 2
<span class="comment">; Instrument #1 -- a simple waveform.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Vary an a-rate signal linearly from 20,000 to 0.</span>
asig <span class="opc">line</span> 20000, p3, 0
<span class="comment">; Send the signal to za variable #1.</span>
<span class="opc">zaw</span> asig, 1
<span class="oblock">endin</span>
<span class="comment">; Instrument #2 -- generates audio output.</span>
<span class="oblock">instr</span> 2
<span class="comment">; Generate a simple sine wave.</span>
asin <span class="opc">oscil</span> 1, 440, 1
<span class="comment">; Modify the sine wave, multiply its amplitude by </span>
<span class="comment">; za variable #1.</span>
a1 <span class="opc">zamod</span> asin, <span class="op">-</span>1
<span class="comment">; Generate the audio output.</span>
<span class="opc">out</span> a1
<span class="comment">; Clear the za variables, prepare them for </span>
<span class="comment">; another pass.</span>
<span class="opc">zacl</span> 0, 2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="comment">; Play Instrument #1 for 2 seconds.</span>
<span class="stamnt">i</span> 1 0 2
<span class="comment">; Play Instrument #2 for 2 seconds.</span>
<span class="stamnt">i</span> 2 0 2
<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="idp54644672"></a>
<h2>See Also</h2>
<p>
<a class="link" href="zacl.html" title="zacl"><em class="citetitle">zacl</em></a>,
<a class="link" href="zkcl.html" title="zkcl"><em class="citetitle">ziw</em></a>,
<a class="link" href="zkmod.html" title="zkmod"><em class="citetitle">ziwm</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp54646680"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Robin Whittle</td>
</tr>
<tr>
<td>Australia</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
</table>
<p>
</p>
<p>New in version 3.45</p>
<p>Example written by Kevin Conder.</p>
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