/usr/lib/pd/extra/mapping/iir-help.pd is in pd-mapping 0.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #N canvas 1 53 683 513 10;
#X floatatom 266 204 5 0 0 0 - - -;
#X text 22 11 data;
#X obj 27 172 t f f;
#X msg 67 100 0;
#X msg 68 121 1;
#X obj 441 294 timeroll;
#X obj 235 294 timeroll;
#X obj 234 234 iir 5;
#X obj 27 294 timeroll;
#X obj 27 30 vsl 15 128 0 1 0 0 empty empty empty 0 -8 0 8 -262144
-1 -1 0 1;
#X text 504 276 high-pass;
#X text 240 276 low-pass;
#X text 83 441 original;
#X text 67 467 For more info on IIR:;
#X obj 116 483 pddp/pddplink http://www.dspguru.com/info/faqs/iirfaq.htm
;
#X text 89 27 [iir] computes a infinite impulse response low-pass filter.
;
#X msg 234 124 reset;
#X msg 242 147 reset 10;
#X text 293 126 reset internal state;
#X text 313 145 reset internal state to a specific value;
#N canvas 466 198 494 344 META 0;
#X text 12 175 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 95 INLET_1 float;
#X text 12 115 OUTLET_0 float;
#X text 12 155 AUTHOR Cyrille Henry and Hans-Christoph Steiner;
#X text 12 5 KEYWORDS control abstraction;
#X text 12 45 DESCRIPTION compute a infinite impulse response low-pass
filter;
#X text 12 75 INLET_0 float reset;
#X text 12 135 OUTLET_1 float;
#X restore 622 484 pd META;
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