/usr/share/puredata/doc/3.audio.examples/G09.pitchshift.pd is in puredata-doc 0.47.1-3.
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 text 68 9 PITCH SHIFTER;
#X obj 205 269 pack 0 200;
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#X msg 492 56 \; transpose 0 \; window 100 \; delay 0;
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#X text 53 86 <-- transposition;
#X text 96 99 (halftones);
#X text 82 163 speed;
#X text 81 177 change;
#X text 281 111 <--window (msec);
#X text 54 252 tape head;
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#X text 153 538 sample loop for;
#X text 153 555 test signal;
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#X msg 161 64 \; readfile ../sound/bell.aiff;
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#X text 425 153 This is a classic rotating-tape-head style pitch shifter
using the vd~ variable delay object. Ther are two moving tape heads
\, each of which is loudest at the middle of its trajectory \, and
enveloped out at the moment it has to jump back (or forward) to start
another scratch. Most of the brain work is in computing how fast the
tape heads have to move to get the desired transposition.;
#X text 425 272 The "window size" is the total trajectory of the read
points in the delay line \, in milliseconds. The delay times are controlled
by a phasor~ object. The second delay time \, 180 degrees out of phase
from the first one \, is computed using the "wrap" object.;
#X text 423 362 The "window size" is the total trajectory of the read
points in the delay line \, in milliseconds. The delay times are controlled
by a phasor~ object. The second delay time \, 180 degrees out of phase
from the first one \, is computed using the "wrap" object.;
#X text 422 454 The cos~ objects compute the fadein and fadeout of
the two delay line outputs. They each traverse the positive half of
the cosine waveform (phase -0.25 to +0.25) over the time the phase
goes from one end to the other.;
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#X text 689 534 updated for Pd version 0.37-1;
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#X text 317 222 delay;
#X text 314 240 (msec);
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#X text 55 265 rotation freq;
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