/usr/lib/pd/extra/iemlib/FIR~-help.pd is in pd-iemlib 1.20.1-1.
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 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #N canvas 345 25 559 627 10;
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#X array fir_coeff 256 float 0;
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#X text 32 96 % cpu;
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#X msg 109 91 read -resize lp1.wav fir_coeff;
#X msg 114 112 read -resize lp2.wav fir_coeff;
#X msg 121 132 read -resize lp3.wav fir_coeff;
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#X msg 359 105 set fir_coeff 256;
#X msg 373 127 set fir_coeff2 256;
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#X obj 343 155 FIR~ fir_coeff 256;
#X text 398 517 IEM KUG;
#X text 382 505 musil;
#X text 412 505 @;
#X text 418 505 iem.at;
#X text 333 494 (c) Thomas Musil 2000 - 2005;
#X text 381 527 Graz \, Austria;
#X text 15 13 FIR~;
#X text 50 12 convolve a signal with an array;
#X text 276 5 1.arg: <symbol> array-name;
#X text 276 15 2.arg: <float> convolution-length;
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