/usr/lib/pd/extra/cyclone/allpass~-help.pd is in pd-cyclone 0.2~beta1-2.
This file is owned by root:root, with mode 0o644.
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#X text 0 19 LICENSE SIBSD;
#X text 0 133 LIBRARY cyclone;
#X text 0 57 INLET_0 signal;
#X text 0 0 KEYWORDS filter pass;
#X text 0 76 INLET_1 float delay time;
#X text 0 95 INLET_2 float gain;
#X text 0 114 OUTLET_0 signal;
#X text 0 38 DESCRIPTION allpass filter for signal;
#X text 1 153 VERSION 0.2-beta1;
#X text 1 171 AUTHOR Krzysztof Czaja;
#X text 2 189 RELEASE_DATE 2002;
#X text 3 208 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
;
#X text 3 240 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;
#X obj 15 36 cyclone/svf~;
#X obj 103 37 cyclone/comb~;
#X restore 202 667 pd Related_objects;
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#X text 12 23 allpass filter for signal;
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#X text 165 58 generate short noisebursts;
#N canvas 1 81 431 311 burst 0;
#X obj 132 184 noise~;
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#X obj 179 54 inlet;
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#X text 7 3 create noise bursts;
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#X restore 145 89 pd burst;
#X text 199 110 del time / gain can also be;
#X text 198 133 using a signal to control gain;
#X text 198 145 the gain coeff is ignored \, see below;
#X msg 89 168 clear;
#X text 164 361 - signal to pass;
#X text 116 491 signal;
#X text 114 362 signal;
#X text 97 596 an all pass filter passes all frequencies equally \,
but changes the phase relationship between various frequencies. It
does this by varying its propogation delay with frequency.;
#X text 170 492 - output of allpass filter with del time;
#X obj 493 2 allpass~;
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#X obj 82 490 cnv 17 3 17 empty empty 0 5 9 0 16 -228856 -162280 0
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#X text 114 401 float;
#X text 164 401 - delay time;
#X text 114 440 float;
#X text 164 440 - gain;
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#X obj 146 308 output~;
#X text 97 530 1) float - maximum delay time (default 10ms);
#X text 97 543 2) float - initial delay time;
#X obj 145 241 cyclone/allpass~ 100 4 0.7;
#X text 97 555 3) float - initial gain coefficient;
#X text 199 121 specified using signals. When;
#X text 114 377 clear;
#X text 164 376 - clears the buffer;
#X text 164 416 - delay time;
#X text 114 416 signal;
#X text 164 453 - gain;
#X text 114 453 signal;
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