/usr/lib/puredata/doc/3.audio.examples/B08.sampler.loop.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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#N canvas 0 0 450 300 graph1 0;
#X array tabread4-out 44100 float 0;
#X coords 0 1.02 44100 -1.02 200 130 1;
#X restore 632 200 graph;
#N canvas 0 0 450 300 graph1 0;
#X array table17 44103 float 0;
#X coords 0 1.02 44103 -1.02 200 130 1;
#X restore 631 14 graph;
#X obj 568 496 loadbang;
#X obj 65 277 tabwrite~ tabread4-out;
#X obj 34 308 hip~ 5;
#X floatatom 34 54 0 0 0 0 - - -;
#X text 241 215 read from the table;
#X text 49 11 LOOPING SAMPLER;
#X text 83 54 <-- frequency (Hz.);
#X floatatom 65 107 0 0 0 0 - - -;
#X obj 65 133 * 441;
#X obj 34 160 *~ 0;
#X obj 34 187 +~ 1;
#X text 110 248 <-- click to display output;
#X obj 34 80 phasor~ 0;
#X msg 65 245 bang;
#X text 110 108 <-- chunk size (100ths of a second);
#X obj 561 395 adc~ 1;
#X msg 575 422 bang;
#X text 615 423 <-- click here to record your own sample;
#X text 678 501 v-- re-read the original sample;
#X text 14 540 In this patch you will frequently hear discontinuities
at the looping point. If you're working in a studio \, you can sometimes
find "good" loop points for samples. Another approach \, better for
live situations \, is shown in the next patch.;
#X text 80 159 <-- readjust phase for range 0 - (chunk size);
#X text 79 187 <-- add one to avoid beginning of table;
#X obj 568 549 soundfiler;
#X text 629 153 ---- 44103 samples ----;
#X text 643 336 ---- 1 second ------;
#X obj 34 335 output~;
#X text 742 591 updated for Pd version 0.37;
#X obj 34 216 tabread4~ table17;
#X obj 562 455 tabwrite~ table17;
#X msg 568 524 read ../sound/voice.wav table17;
#X text 16 409 This is a looping sampler in which you specify the number
of loops per second (the frequency) and the size of the chunk to loop.
If the frequency is less than about 20 \, you will hear repetition
and the chunk size will sound like transposition. For frequencies above
50 or so \, you hear a tone whose timbre is controlled by the chunk
size (best kept below 10 or so.) Remember you can use the "shift" key
on number boxes to make fine adjustments.;
#X connect 2 0 31 0;
#X connect 4 0 27 0;
#X connect 4 0 27 1;
#X connect 5 0 14 0;
#X connect 9 0 10 0;
#X connect 10 0 11 1;
#X connect 11 0 12 0;
#X connect 12 0 29 0;
#X connect 14 0 11 0;
#X connect 15 0 3 0;
#X connect 17 0 30 0;
#X connect 18 0 30 0;
#X connect 29 0 4 0;
#X connect 29 0 3 0;
#X connect 31 0 24 0;
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