/usr/lib/pd/extra/cyclone/slide~-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 0 31 LICENSE SIBSD;
#X text 0 139 LIBRARY cyclone;
#X text 0 121 OUTLET_0 signal;
#X text 0 67 INLET_0 signal;
#X text 0 85 INLET_1 float;
#X text 0 103 INLET_2 float;
#X text 0 49 DESCRIPTION smooth-out changes in signal values;
#X text 0 0 KEYWORDS signal smooth smooth-out changes slideup slidedown
slide;
#X text 0 158 VERSION 0.2-beta1;
#X text 0 176 AUTHOR Krzysztof Czaja;
#X text 1 194 RELEASE_DATE 2002;
#X text 2 213 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
;
#X text 2 245 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 text 19 24 Smooth-out changes in signal values;
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#X msg 208 60 1;
#X msg 169 60 0;
#X text 365 46 slide down;
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#X obj 190 106 sig~;
#X floatatom 190 85 0 0 0 0 - - -;
#X text 271 45 slide up;
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#X text 108 358 signal;
#X text 183 358 - signal to smooth out;
#X text 108 384 float;
#X text 108 411 float;
#X text 108 448 signal;
#X text 183 448 - smoothed out signal;
#X text 91 488 1) float;
#X text 91 510 2) float;
#X text 110 557 Slide filters an input signal logarithmically between
changes in signal value. The formula is y(n) = y(n-1) + ((x(n) - y(n-1))/slide).
It's particularly useful for envelope following and lowpass filtering.
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#X msg 266 64 44100;
#X msg 355 65 44100;
#X msg 307 64 220500;
#X msg 395 65 220500;
#X obj 190 161 cyclone/slide~ 44100 44100;
#X text 183 384 - slideup value in samples;
#X text 183 411 - slidedown vlaue in samples;
#X text 183 488 - initial slideup value in samples;
#X text 183 510 - initial slidedown value in samples;
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