/usr/share/puredata/doc/4.data.structures/voice.pd is in puredata-doc 0.46.7-3.
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 msg 189 367 0 20;
#X obj 180 120 data-start template-toplevel;
#X obj 6 150 data-array template-toplevel amp template-amp;
#X obj 433 148 data-array template-toplevel pitch template-pitch;
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#X text 13 7 This is an abstraction used in the sequencer example.
Here we take care of the audio synthesis \, according to timed controls
from the the "data-start" and "data-array" subpatches.;
#X text 521 459 calculate time-varying center frequencies;
#X text 470 512 ... for three VCFs acting on a noise source.;
#X text 85 394 Amplitude;
#X text 86 410 envelope;
#X text 94 549 summing bus;
#X text 346 62 Pitch is in eighth-tones (because 4 pixels per half
tone looks reasonable on the screen.) Hence the * 0.25 objects below.
;
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