<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>vactrol</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="urd.html" title="urd" /> <link rel="next" href="vadd.html" title="vadd" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">vactrol</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="urd.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="vadd.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="vactrol"></a> <div class="titlepage"></div> <a id="IndexVactrol" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">vactrol</span> </h2> <p>vactrol — Envelope follower unit generator. </p> </div> <div class="refsect1"> <a id="idm281472876636680"></a> <h2>Description</h2> <p> Envelope follower unit generator emmulating a Perkin Elmer Vactrole VTL5C3/2. </p> </div> <div class="refsect1"> <a id="idm281472876566760"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>vactrol</strong></span> asig [iup, idown]</pre> </div> <div class="refsect1"> <a id="idm281472876564680"></a> <h2>Initialisation</h2> <p> <span class="emphasis"><em>iup</em></span> -- The rise time of the filter, which defaults to 20, </p> <p> <span class="emphasis"><em>idown</em></span> -- The fall time of the filter, which defaults to 3000, </p> </div> <div class="refsect1"> <a id="idm281472876562184"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- The signal from which to extract the envelope. </p> </div> <div class="refsect1"> <a id="idm281472876560520"></a> <h2>Examples</h2> <p> Here is an example of the vactrol opcode. It uses the file <a class="ulink" href="examples/vactrol.csd" target="_top"><em class="citetitle">vactrol.csd</em></a>. </p> <div class="example"> <a id="idm281472876558664"></a> <p class="title"> <strong>Example 1043. Example of the vactrol 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="idm281472700555192"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsInstruments></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">1</span> <span class="nb">lfo</span> <span class="mf">0.3</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">4</span> a<span class="n">2</span> <span class="nb">vactrol</span> a<span class="n">1</span> a<span class="n">3</span> <span class="nb">oscili</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">440</span> <span class="nb">out</span> a<span class="n">1</span><span class="o">*</span>a<span class="n">3</span><span class="p">,</span>a<span class="n">2</span><span class="o">*</span>a<span class="n">3</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> </p> <p> This opcode can reduce zipper noise produced from complex envelope tracking as it smooths the transitions. </p> </div> <div class="refsect1"> <a id="idm281472876553944"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>after Julian Parker</td> </tr> <tr> <td>New in 6.04</td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="urd.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="vadd.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">urd </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> vadd</td> </tr> </table> </div> </body> </html>