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/usr/lib/pd/extra/cyclone/allpass~-help.pd is in pd-cyclone 0.2~beta1-2.

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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 12 23 allpass filter for signal;
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#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;
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#X text 97 530 1) float - maximum delay time (default 10ms);
#X text 97 543 2) float - initial delay time;
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#X text 199 121 specified using signals. When;
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