/usr/share/puredata/doc/3.audio.examples/G07.shaker.pd is in puredata-doc 0.48.1-3.
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 80 281 line~;
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#X text 51 8 THE "SHAKER";
#X obj 279 86 + 1;
#X obj 279 109 mod 4;
#X obj 244 83 f;
#X obj 284 160 random 1000;
#X obj 244 135 t f b;
#X obj 244 37 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1
;
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#X obj 284 187 expr 2 * $f1/1000 - 0.7;
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#X obj 244 58 metro 50;
#X obj 244 218 pack 0 0 200;
#X text 23 118 frequency;
#X text 225 17 on/off;
#X text 344 13 time constant (msec);
#X text 536 511 updated for Pd version 0.37-1;
#X text 266 306 This is a time-varying comb filter \, combining four
delayed copies of the input signal. The amplitude of each delayed copy
varies randomly between -0.7 and +1.3. Each time the metronome goes
off \, one of the four delay's gains is changed in sequence. The change
occurs over the next four ticks of the metronome (so \, if the metronome
ticks every 50 msec \, each message to a line~ has a second argument
of 200.);
#X text 268 424 Any collection of four gains for the four delayed copies
of the signal (including the original) defines some sort of irregular
comb filter. The peaks and valleys of the comb filter shift constantly
as the gains change to new \, random values.;
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