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/usr/lib/pd/extra/iemlib/FIR~-help.pd is in pd-iemlib 1.20.1-1.

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The actual contents of the file can be viewed below.

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#N canvas 345 25 559 627 10;
#N canvas 0 22 450 300 (subpatch) 0;
#X array fir_coeff 256 float 0;
#X coords 0 1 255 -1 256 140 1;
#X restore 63 195 graph;
#X obj 109 154 soundfiler;
#X floatatom 4 133 5 0 0 0 - - -;
#X text 32 96 % cpu;
#X obj 4 93 dsp;
#X obj 4 73 tgl 15 0 empty empty dsp_ON/OFF 2 -8 0 10 -225271 -42246
-90881 1 1;
#X floatatom 413 444 7 0 0 0 - - -;
#X obj 342 323 dac~;
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#X obj 343 75 noise~;
#X floatatom 403 462 7 0 0 0 - - -;
#X obj 109 71 bng 15 250 50 1 empty empty loadbang 0 -8 0 10 -225271
-24198 -90881;
#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;
#X obj 19 406 soundfiler;
#N canvas 0 22 450 300 (subpatch) 0;
#X array fir_coeff2 256 float 0;
#X coords 0 1 255 -1 256 140 1;
#X restore 70 452 graph;
#X msg 20 385 read -resize lp3.wav fir_coeff2;
#X obj 20 365 bng 15 250 50 1 empty empty loadbang 0 -8 0 10 -225271
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#X msg 359 105 set fir_coeff 256;
#X msg 373 127 set fir_coeff2 256;
#X floatatom 17 113 5 0 0 0 - - -;
#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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