/usr/lib/puredata/doc/3.audio.examples/D04.envelope.quartic.pd is in puredata-doc 0.43.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X obj 21 345 osc~;
#X obj 21 370 *~;
#X obj 81 350 line~;
#X obj 21 320 line~;
#X obj 163 455 osc~;
#X obj 212 483 *~;
#X obj 234 366 line~;
#X obj 163 366 line~;
#X obj 163 313 sqrt;
#X obj 163 339 sqrt;
#X obj 234 313 sqrt;
#X obj 234 339 sqrt;
#X obj 163 398 *~;
#X obj 163 428 *~;
#X obj 234 398 *~;
#X obj 234 427 *~;
#X obj 163 288 unpack;
#X obj 234 288 unpack;
#X obj 21 295 r freq;
#X obj 81 326 r amp;
#X obj 163 263 r freq;
#X obj 234 263 r amp;
#X msg 340 277 \; amp 0 5000 \;;
#X msg 340 232 \; amp 1 5000 \;;
#X msg 492 278 \; amp 0 1000 \;;
#X msg 494 232 \; amp 1 1000 \;;
#X msg 337 357 \; freq 1760 5000 \;;
#X msg 338 404 \; freq 55 5000 \;;
#X msg 493 357 \; freq 1760 1000 \;;
#X msg 496 405 \; freq 55 1000 \;;
#X text 90 15 QUARTIC AND LINEAR ENVELOPES COMPARED;
#X obj 341 464 loadbang;
#X msg 341 492 \; amp 1 \; freq 1760;
#X text 22 265 LINEAR;
#X text 168 236 QUARTIC;
#X obj 21 397 output~;
#X obj 212 509 output~;
#X text 14 123 In the quartic example \, for both the amplitude and
the frequency \, we have to take the fourth root of the target value
(which we get by taking square root twice.) Then we raise the line~
output to the fourth power by squaring twice (the *~ objects \, whose
left and right inlets are the same.) The cost is mostly that of the
four additional *~ objects.;
#X text 350 553 updated for Pd version 0.37;
#X text 19 39 This patch has two sine wave oscillators \, one with
linear envelopes \, the other with quartic ones which sound more uniform.
The message boxes sweep the amplitude and frequency up and down. You
can compare the two to see that quartic-shaped changes sound more uniform
than linear ones.;
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#X connect 7 0 12 1;
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#X connect 12 0 13 1;
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#X connect 14 0 15 1;
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#X connect 31 0 32 0;
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