/usr/lib/pd/extra/mapping/iir-help.pd is in pd-mapping 0.2-2.
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 | #N canvas 127 104 683 513 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 440 294 timeroll;
#X obj 234 294 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;
#X connect 0 0 7 1;
#X connect 2 0 8 0;
#X connect 2 1 7 0;
#X connect 3 0 2 0;
#X connect 4 0 2 0;
#X connect 7 0 6 0;
#X connect 7 1 5 0;
#X connect 9 0 2 0;
#X connect 16 0 7 0;
#X connect 17 0 7 0;
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