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<h2>
<span class="refentrytitle">gain</span>
</h2>
<p>gain —
Adjusts the amplitude audio signal according to a root-mean-square value.
</p>
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<div class="refsect1">
<a id="idm281472927965288"></a>
<h2>Description</h2>
<p>
Adjusts the amplitude audio signal according to a root-mean-square value.
</p>
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<div class="refsect1">
<a id="idm281472927903816"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>gain</strong></span> asig, krms [, ihp] [, iskip]</pre>
</div>
<div class="refsect1">
<a id="idm281472927901656"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ihp</em></span> (optional, default=10) -- half-power point (in Hz) of a special internal low-pass filter. The default value is 10.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of internal data space (see <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>). The default value is 0.
</p>
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<div class="refsect1">
<a id="idm281472927898216"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input audio signal
</p>
<p>
<span class="emphasis"><em>gain</em></span> provides an amplitude modification of <span class="emphasis"><em>asig</em></span> so that the output <span class="emphasis"><em>ares</em></span> has rms power equal to <span class="emphasis"><em>krms</em></span>. <a class="link" href="rms.html" title="rms"><em class="citetitle">rms</em></a> and <span class="emphasis"><em>gain</em></span> used together (and given matching <span class="emphasis"><em>ihp</em></span> values) will provide the same effect as <a class="link" href="balance.html" title="balance"><em class="citetitle">balance</em></a>.
</p>
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<div class="refsect1">
<a id="idm281472927891624"></a>
<h2>Examples</h2>
<p>
Here is an example of the gain opcode. It uses the file <a class="ulink" href="examples/gain.csd" target="_top"><em class="citetitle">gain.csd</em></a>.
</p>
<div class="example">
<a id="idm281472927889848"></a>
<p class="title">
<strong>Example 369. Example of the gain 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="idm281472757990280"></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 realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o gain.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>
a<span class="n">src</span> <span class="nb">buzz</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">440</span><span class="p">,</span> <span class="vg">sr</span><span class="o">/</span><span class="mi">440</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; band-limited pulse train.</span>
a<span class="n">1</span> <span class="nb">reson</span> a<span class="n">src</span><span class="p">,</span> <span class="mi">1000</span><span class="p">,</span> <span class="mi">100</span> <span class="c1">; Sent through</span>
a<span class="n">2</span> <span class="nb">reson</span> a<span class="n">1</span><span class="p">,</span> <span class="mi">3000</span><span class="p">,</span> <span class="mi">500</span> <span class="c1">; 2 filters</span>
k<span class="n">rms</span> <span class="nb">rms</span> a<span class="n">src</span> <span class="c1">; then balanced</span>
a<span class="n">fin</span> <span class="nb">gain</span> a<span class="n">2</span><span class="p">,</span> k<span class="n">rms</span> <span class="c1">; with source</span>
<span class="nb">outs</span> a<span class="n">fin</span><span class="p">,</span> a<span class="n">fin</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">;sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472927885560"></a>
<h2>See Also</h2>
<p>
<a class="link" href="balance.html" title="balance"><em class="citetitle">balance</em></a>,
<a class="link" href="rms.html" title="rms"><em class="citetitle">rms</em></a>
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