puredata/pd-externals-HOWTO.pdf

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   6 (definitions and prerequisites)
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  12 (classes, instances, objects)
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  18 (internals, externals und libraries)
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  24 (my first external: helloworld)
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  27 << /S /GoTo /D (subsection.2.1) >>
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  30 (the interface to pd)
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  36 (a class and its dataspace)
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  54 (constructor: instantiation of an object)
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  66 (a simple external: counter)
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  90 (the countermethod)
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