/usr/lib/pd/extra/cyclone/overdrive~-help.pd is in pd-cyclone 0.2~beta1-2.
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 1 32 LICENSE SIBSD;
#X text 1 127 LIBRARY cyclone;
#X text 1 108 OUTLET_0 signal;
#X text 1 70 INLET_0 float signal;
#X text 1 0 KEYWORDS signal amplifier amp overdriven distortion analog
sumulate;
#X text 1 51 DESCRIPTION simulate an analog amplifier being overdriven
;
#X text 1 89 INLET_1 ?????;
#X text 0 147 VERSION 0.2-beta1;
#X text 0 165 AUTHOR Krzysztof Czaja;
#X text 1 183 RELEASE_DATE 2002;
#X text 2 202 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
;
#X text 2 234 HELP_PATCH_AUTHORS Christoph Kummerer. Revised by Jonathan
Wilkes for Pd-extended 0.42 to conform to the PDDP template. Alex Cleveland
updated this patch for Pd-l2ork version 2013.05.28. Fred Jan Kraan
adapted the patch to pd-extended 2015-02-02;
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#X text 6 1 Related Objects;
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#X obj 480 6 overdrive~;
#X text 112 367 float;
#X text 112 388 signal;
#X text 112 454 signal;
#X text 181 454 - simulated overdriven signal;
#X text 95 493 1) float;
#X text 181 493 - intial drive;
#X text 124 531 overdrive~ simulates the distortion caused when an
analog amplifier is fed a signal that is too high for the inputs. This
is generally known as "overdriving" the amplifier \, and it causes
a characteristic distortion that is often used to generate a "fat"
sound.;
#X floatatom 133 116 5 0 0 0 - - -;
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#X obj 14 94 osc~ 400;
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#X text 12 23 Simulate an analog amplifier being overdriven;
#X text 18 48 simulates distortion by applying a non-linear transfer
function to the incoming signal.;
#X text 124 608 If the "drive" is 1 \, the signal is unchanged. Increasing
the "drive" increases the amount of distortion. If the "drive" is less
than 1 \, then it causes a different kind of distortion. If the "drive"
is less than 0 \, VERY LOUD distortion can result \, so be careful!
;
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#X obj 133 205 cyclone/overdrive~;
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#X obj 125 80 tabwrite~ \$0overdrive;
#X obj 50 137 metro 100;
#X obj 126 28 inlet~;
#X text 43 254 The view array is placed in a subpatch as it can cause
dropouts in the audio;
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#X text 109 236 -1;
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#X restore 126 111 graph;
#X text 8 5 View graph;
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#X restore 210 295 pd view waveform;
#X text 319 292 <- click to see wave form;
#X text 179 377 - set drive factor;
#X text 181 417 - set amount of overdrive (amplification);
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