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/usr/share/puredata/doc/3.audio.examples/C09.sample.hold.pd is in puredata-doc 0.46.7-3.

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#X text 67 8 SAMPLE AND HOLD;
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#X text 254 233 <-- reset phase;
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#X text 16 31 Another analog favorite \, the sample and hold unit freezes
an audio signal on command. In the Pd version \, the second input of
samphold~ triggers it \, and the first input becomes the output's new
value whenever the trigger decreases from one sample to the next. This
is ideal for updating values when a phasor wraps around.;
#X text 679 428 updated for Pd version 0.37;
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