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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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