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<refentry id="transeg">
<indexterm id="IndexTranseg"><primary>transeg</primary></indexterm>
<refentryinfo><title>Signal Generators:Linear and Exponential Generators</title></refentryinfo>
<refmeta>
<refentrytitle>transeg</refentrytitle>
</refmeta>
<refnamediv>
<refname>transeg</refname>
<refpurpose>
Constructs a user-definable envelope.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Constructs a user-definable envelope.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>transeg</command> ia, idur, itype, ib [, idur2] [, itype] [, ic] ...</synopsis>
<synopsis>kres <command>transeg</command> ia, idur, itype, ib [, idur2] [, itype] [, ic] ...</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ia</emphasis> -- starting value.
</para>
<para>
<emphasis>ib, ic,</emphasis> etc. -- value after <emphasis>idur</emphasis> seconds.
</para>
<para>
<emphasis>idur, idur2,</emphasis> etc. -- duration in seconds of segment
</para>
<para>
<emphasis>itype, itype2,</emphasis> etc. -- if 0, a straight line is produced. If non-zero, then <emphasis>transeg</emphasis> creates the following curve, for <emphasis>n</emphasis> steps:
<literallayout>
ibeg + (ivalue - ibeg) * (1 - exp( i*itype/(n-1) )) / (1 - exp(itype))
</literallayout>
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
If <emphasis>itype</emphasis> > 0, there is a slowly rising, fast decaying (convex) curve, while if <emphasis>itype</emphasis> < 0, the curve is fast rising, slowly decaying (concave). See also <link linkend="GEN16"><citetitle>GEN16</citetitle></link>.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="expsega"><citetitle>expsega</citetitle></link>,
<link linkend="expsegr"><citetitle>expsegr</citetitle></link>,
<link linkend="linseg"><citetitle>linseg</citetitle></link>,
<link linkend="linsegr"><citetitle>linsegr</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namejohn;</member>
<member>University of Bath, Codemist. Ltd.</member>
<member>Bath, UK</member>
<member>October 2000</member>
</simplelist>
</para>
<para>New in Csound version 4.09</para>
<para>Thanks goes to Matt Gerassimoff for pointing out the correct command syntax.</para>
</refsect1>
</refentry>
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