/usr/lib/puredata/doc/3.audio.examples/H11.shelving.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | #N canvas 25 22 868 421 12;
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#X restore 621 28 graph;
#X obj 29 245 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
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#X text 676 334 frequency;
#N canvas 876 177 375 255 startup 0;
#X obj 22 24 loadbang;
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#X obj 22 67 f \$0;
#X text 35 195 This subpatch loads initial;
#X text 31 219 values in number boxes.;
#X msg 22 91 \; \$1-pole 60 \; \$1-zero 20;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 5 0;
#X restore 289 390 pd startup;
#X floatatom 281 265 3 -99 99 0 - #0-pole -;
#X text 559 316 gain=0;
#X text 108 34 SHELVING FILTER;
#X obj 29 378 filter-graph2 \$0-tab1;
#X obj 29 266 filter-graph1 100 22050;
#X text 796 330 22050;
#X obj 232 314 rpole~;
#X obj 281 288 / 100;
#X floatatom 335 264 4 -100 100 0 - #0-zero -;
#X obj 335 287 / 100;
#X obj 231 346 rzero~;
#X text 608 21 5;
#X text 616 327 0;
#X text 604 258 1;
#X text 16 58 This patch demonstrates using the raw filters \, rpole~
and rzero~ (raw \, real-valued one-pole and one-zero filters) \, to
make a shelving filter.;
#X text 14 109 If the pole is at p and the zero is at q \, the gain
at DC is (1-q)/(1-p) and the gain at Nyquist is (1+q)/(1+p). If the
pole location is close to plus or minus one \, this can give large
gains unless q is in the same vicinity. (try \, for example \, p=90%
\, q=70%).;
#X text 11 191 The crossover region varies from DC to Nyquist as p
and q decrease from 100% to -100%.;
#X text 278 241 pole;
#X text 334 241 zero;
#X text 383 263 (in hundredths);
#X text 610 387 updated for Pd version 0.39;
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#X connect 15 0 8 3;
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