/usr/share/puredata/doc/3.audio.examples/J06.enveloping.pd is in puredata-doc 0.46.7-3.
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#X obj 47 52 phasor~;
#X text 126 2 ENVELOPE GENERATORS FROM LINE SEGMENTS;
#X obj 19 514 output~;
#X text 610 698 updated for Pd version 0.39;
#X obj 46 98 *~;
#X obj 11 165 -~;
#X obj 10 214 *~;
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#X obj 60 386 *~ 2;
#X obj 60 409 min~;
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#X obj 60 358 phasor~ 200;
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#X text 639 514 ----- 0.02 second ----;
#X text 86 24 <-- frequency (Hz.);
#X text 636 322 ----- 0.5 second ------;
#X text 107 72 <-- slope of rise segment. Just multiply this by the
phase to make the segment.;
#X text 129 140 Subtract this to make the phasor cross zero at the
desired point of the cycle.;
#X text 107 173 <-- slope of decay segment.;
#X text 112 190 multiply the phasor (with the zero crossing shifted
as above) by the desired slope \, negating it so the segment points
downward.;
#X text 63 244 minimum of rise and decay segments (makes a triangle
wave);
#X obj 17 267 clip~ 0 1;
#X text 109 266 clip the triangle wave to between 0 and 1 \, to make
the sustain and silent regions.;
#X text 108 121 <-- Duty cycle (end of decay segment as % of cycle.)
;
#X text 60 304 <-- click to graph envelope shape;
#X text 91 456 <-- click to graph audio waveform;
#X text 172 364 this makes a quick-and-dirty triangle wave;
#X text 172 382 as described in the previous patch. It's;
#X text 172 419 to listen to.;
#X text 97 511 You can make a phasor-generated envelope generator using
"min" and "clip" to combine line segments. Here a rise segment starts
at phase 0 \, and a decay segment passes through zero at a controllable
point (the "duty cycle" \, as a percentage of a cycle.) Each has a
controllable slope (in units per cycle). The resulting triangle wave
(the minimum of the rise and decay segments) is limited to 1 \, thus
making a flat "sustain" segment (unless the rise and decay segments
meet at a value less than one \, in which case there is none). Limiting
below by 0 prevents us from following the decay segment into negative
values. Reasonable values to start with are 6 Hz. frequency \, rise
and decay slope 10 \, duty cycle 75%.;
#X text 173 401 used here so we'll have something;
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