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node22.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<!--Converted with LaTeX2HTML 2002-2-1 (1.71)
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>Major triad</TITLE>
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<META NAME="description" CONTENT="Major triad">
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HREF="node23.html">Conversion between frequency and</A>
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HREF="node21.html">Smoothed amplitude control with</A>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00594000000000000000">
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Major triad</A>
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</H2>
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<A NAME="sec1.triad"></A>
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<P>
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Example A05.output.subpatch.pd, whose active ingredients are shown in Figure
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<A HREF="node20.html#fig01.12">1.12</A> (part c), presents three sinusoids with frequencies in the
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ratio 4:5:6, so that the lower two are separated by a major third, the
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upper two by a minor third, and the top and bottom by a fifth. The lowest
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frequency is 440, equal to A above middle C, or MIDI 69. The others are
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approximately four and seven half-steps higher, respectively. The three
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have equal amplitudes.
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<P>
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The amplitude control in this example is taken care of by a new object called
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<TT>output~</TT>. This isn't a built-in object of Pd, but is itself a Pd patch
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which lives in a file, ``output.pd". (You can see the internals of
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<TT>output~</TT> by opening the properties menu for the box and selecting
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``open".) You get two controls, one for amplitude in dB (100 meaning ``unit
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gain"), and a ``mute" button. Pd's audio processing is turned on automatically
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when you set the output level--this might not be the best behavior in
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general, but it's appropriate for these example patches. The mechanism for
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embedding one Pd patch as an object box inside another is discussed in Section
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<A HREF="node67.html#sect4.encapsulation">4.7</A>.
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<BR>
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HREF="node23.html">Conversion between frequency and</A>
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<B> Up:</B> <A NAME="tex2html862"
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HREF="node18.html">Examples</A>
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<B> Previous:</B> <A NAME="tex2html856"
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HREF="node21.html">Smoothed amplitude control with</A>
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<B> <A NAME="tex2html864"
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HREF="node4.html">Contents</A></B>
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<B> <A NAME="tex2html866"
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HREF="node201.html">Index</A></B>
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<!--End of Navigation Panel-->
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<ADDRESS>
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Miller Puckette
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2006-12-30
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</ADDRESS>
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