/usr/lib/pd/extra/cyclone/buffir~-help.pd is in pd-cyclone 0.1~alpha55-3.
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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | #N canvas 41 53 873 616 10;
#X declare -lib cyclone;
#X floatatom 454 384 0 0 0 0 - - -;
#X obj 330 374 noise~;
#X obj 330 441 *~ 0.05;
#X obj 330 474 dac~;
#X obj 69 165 sig~ 1;
#X text 231 167 Length (samps);
#X obj 576 111 loadbang;
#X msg 41 123 clear;
#X floatatom 209 165 0 0 0 0 - - -;
#X floatatom 160 136 0 0 0 0 - - -;
#X obj 575 144 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144
-1 -1;
#N canvas 480 212 405 395 genRamp 0;
#X obj 39 197 sel 0 1;
#X obj 81 254 i;
#X obj 39 146 sel 1;
#X msg 111 100 clear;
#X obj 120 206 * 1;
#X obj 120 180 expr ((127. - $f1) / 127.);
#X obj 98 124 - 1;
#X obj 39 75 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
-1;
#X obj 81 282 pack 0 0;
#X text 116 151 exponential ramp down from 1 to 0;
#X text 147 249 makes 50% zeros \, 25% exponential downward ramp \,
25% random;
#X obj 39 99 Uzi 128;
#X obj 39 123 decide;
#X obj 39 174 decide;
#X obj 39 219 urn 128;
#X obj 39 53 inlet;
#X obj 81 316 outlet;
#X connect 0 0 14 0;
#X connect 0 1 1 0;
#X connect 1 0 8 0;
#X connect 2 0 13 0;
#X connect 3 0 14 0;
#X connect 4 0 8 1;
#X connect 5 0 4 0;
#X connect 5 0 4 1;
#X connect 6 0 1 1;
#X connect 6 0 5 0;
#X connect 7 0 3 0;
#X connect 7 0 11 0;
#X connect 8 0 16 0;
#X connect 11 0 12 0;
#X connect 11 2 6 0;
#X connect 12 0 2 0;
#X connect 13 0 0 0;
#X connect 14 0 8 0;
#X connect 15 0 7 0;
#X restore 573 184 pd genRamp;
#X text 33 104 clears input history only;
#X text 186 131 Offset (samps);
#X text 427 186 Generate new fir =>;
#X text 178 216 Initial args: buffer \, offset(samps) \, length(samps)
;
#X text 181 241 256 point max len;
#X text 8 291 integral of buffer from offset to offset + length;
#X text 486 383 number of samples in impulse;
#X obj 570 53 import cyclone;
#X obj 330 409 buffir~ fir_buf 0 10;
#X obj 50 216 buffir~ fir_buf 0 32;
#X obj 574 223 peek~ fir_buf;
#X obj 563 285 table fir_buf 128;
#X obj 50 245 Snapshot~ 100;
#X obj 52 269 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -8 0 10
-262144 -1 -1 0 256;
#X text 15 35 a table based FIR convolution filter;
#X text 16 58 buffir~ is a table based FIR (finite impulse response)
filter. an input signal is convolved with n samples of a buffer. Currently
the maximum number of points is 256;
#X text 503 311 table is a 128-point downwards ramp with random values
here and there with amplitude from 1 to 0;
#X connect 0 0 20 2;
#X connect 1 0 20 0;
#X connect 2 0 3 0;
#X connect 2 0 3 1;
#X connect 4 0 21 0;
#X connect 6 0 10 0;
#X connect 7 0 21 0;
#X connect 8 0 21 2;
#X connect 9 0 21 1;
#X connect 10 0 11 0;
#X connect 11 0 22 0;
#X connect 20 0 2 0;
#X connect 21 0 24 0;
#X connect 24 0 25 0;
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