/usr/lib/pd/extra/ekext/zeroxpos~-help.pd is in pd-ekext 0.1.1-3.
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 91 92 93 94 95 96 | #N canvas 0 0 603 357 10;
#X obj 251 132 block~ 256;
#X obj 144 150 zeroxpos~ 3;
#X obj 40 150 zeroxpos~ -3;
#X text 30 30 Zeroxpos~ finds a zero-crossing point within a dsp-block
;
#X obj 31 96 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X floatatom 40 167 5 0 0 0 - - -;
#X floatatom 144 167 5 0 0 0 - - -;
#X text 228 156 <-- creation argument sets the;
#X text 252 167 zero-crossing point to find;
#X text 251 178 1st \, 2nd \, 3rd etc.;
#X text 249 220 a positive argument finds;
#X text 247 233 the n-th zero crossing from;
#X text 247 245 the start of the block.;
#X text 35 222 a negative argument finds;
#X text 33 233 the n-th zero crossing from;
#X text 33 244 the end of the block.;
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#X restore 207 268 graph;
#X obj 220 87 tabwrite~ block;
#X obj 107 75 osc~ 880;
#X obj 79 284 tabread block;
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#X floatatom 79 301 5 0 0 0 - - -;
#X floatatom 119 167 2 0 0 0 - - -;
#X floatatom 216 167 2 0 0 0 - - -;
#X text 36 193 output is in samples \, right output is direction (polarity)
of zero crossing.;
#X msg 320 94 mode \$1;
#X obj 320 79 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X text 349 77 <--- if the mode is zero \,;
#X text 389 89 zeroxpos will not look;
#X text 395 102 for zero-crossing points;
#X text 404 114 until after it receives a;
#X text 412 126 bang. But if it is set to 1 \,;
#X text 418 138 zeroxpos will continuously;
#X text 424 150 look for zero-crossings \,;
#X text 431 163 and output those stored;
#X text 437 175 in memory when banged.;
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