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<refentry id="vdelay3">
<indexterm id="IndexVdelay3"><primary>vdelay3</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Delay</title></refentryinfo>
<refmeta>
<refentrytitle>vdelay3</refentrytitle>
</refmeta>
<refnamediv>
<refname>vdelay3</refname>
<refpurpose>
An variable time delay with cubic interpolation.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
<emphasis>vdelay3</emphasis> is experimental. It is the same as <link linkend="vdelay"><citetitle>vdelay</citetitle></link> except that it uses cubic interpolation. (New in Version 3.50.)
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>vdelay3</command> asig, adel, imaxdel [, iskip]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>imaxdel</emphasis> -- Maximum value of delay in milliseconds. If <emphasis>adel</emphasis> gains a value greater than <emphasis>imaxdel</emphasis> it is folded around <emphasis>imaxdel</emphasis>. This should not happen.
</para>
<para>
<emphasis>iskip</emphasis> (optional) -- Skip initialization if present and non-zero.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
With this unit generator it is possible to do Doppler effects or chorusing and flanging.
</para>
<para>
<emphasis>asig</emphasis> -- Input signal.
</para>
<para>
<emphasis>adel</emphasis> -- Current value of delay in milliseconds. Note that linear functions have no pitch change effects. Fast changing values of <emphasis>adel</emphasis> will cause discontinuities in the waveform resulting noise.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
<informalexample>
<programlisting>
f1 0 8192 10 1
ims = 100 ; Maximum delay time in msec
a1 <emphasis>oscil</emphasis> 10000, 1737, 1 ; Make a signal
a2 <emphasis>oscil</emphasis> ims/2, 1/p3, 1 ; Make an LFO
a2 = a2 + ims/2 ; Offset the LFO so that it is positive
a3 <emphasis>vdelay</emphasis> a1, a2, ims ; Use the LFO to control delay time
<emphasis>out</emphasis> a3
</programlisting>
</informalexample>
</para>
<para>
Two important points here. First, the delay time must be always positive. And second, even though the delay time can be controlled in k-rate, it is not advised to do so, since sudden time changes will create clicks.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="vdelay"><citetitle>vdelay</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &nameparis;</member>
<member>MIT, Cambridge</member>
<member>1995</member>
</simplelist>
</para>
</refsect1>
</refentry>
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