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

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The actual contents of the file can be viewed below.

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#N canvas 760 81 569 531 10;
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#X obj 0 373 cnv 3 550 3 empty empty inlets 8 12 0 13 -228856 -1 0
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#X obj 79 387 cnv 17 3 17 empty empty 0 5 9 0 16 -228856 -162280 0
;
#X text 107 387 signal;
#X text 107 453 signal;
#X text 162 387 - The signal that was input;
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0;
#N canvas 246 345 428 75 Related_objects 0;
#X obj 0 0 cnv 15 425 20 empty empty empty 3 12 0 14 -204280 -1 0;
#X text 6 1 Related Objects;
#X obj 9 28 abs~;
#X restore 206 524 pd Related_objects;
#N canvas 1058 474 379 288 META 0;
#X text 1 0 KEYWORDS signal max_compatible;
#X text 1 182 WEBSITE http://suita.chopin.edu.pl/~czaja/miXed/externs/cyclone.html
;
#X text 1 60 INLET_0 signal;
#X text 1 99 OUTLET_0 signal;
#X text 1 140 AUTHOR Krzysztof Czaja;
#X text 1 20 LICENSE SIBSD;
#X text 0 120 VERSION 0.2-beta1;
#X text 0 161 RELEASE_DATE 2002;
#X text 1 212 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;
#X text 1 40 DESCRIPTION output the log (to a specified base) of a
signal;
#X text 1 80 INLET_0 float;
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#X obj 79 339 tabwrite~ \$0-signal;
#X obj 516 4 log~;
#X text 8 23 outputs the log (to a specified base) of a signal;
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#X text 230 223 0;
#X text 218 353 -23;
#X obj 454 255 *~ 0.05;
#X obj 77 104 osc~ 220;
#X text 27 46 log~ is useful for generating curves from line~. In the
example below \, log~ with an argument 2 (for log to the base 2) is
used to generate a pitch glissando and a logarithmic amplitude envelope.
;
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#X text 162 413 - base of the alogarithm (e is default);
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#X text 96 490 default base of the logarithm;
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