/usr/lib/pd/extra/iemlib/ap1c~.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 | #N canvas 148 261 488 432 10;
#X obj 22 42 inlet~;
#X obj 52 65 inlet;
#X obj 22 238 outlet~;
#X text 62 42 ~signal_in~;
#X obj 143 152 inlet;
#X text 178 153 <float> interpolation_time [ms];
#X text 28 209 ~filtered signal_out~;
#X text 89 64 <float> -90_degree_frequency [Hz];
#X text 124 235 1.arg: <float> -90_degree_frequency [Hz];
#X text 11 9 ap1c~;
#X text 66 10 allpass 1.order for filter-cascades;
#X obj 87 90 inlet;
#X obj 121 120 inlet;
#X text 163 119 dummy;
#X obj 52 266 outlet;
#X obj 92 289 outlet;
#X obj 127 312 outlet;
#X obj 143 335 outlet;
#X text 140 287 dummy;
#X text 174 311 dummy;
#X text 123 260 3.arg: <float> interpolation_time [ms] (opt.);
#X text 124 89 <float> frequency-shift [-];
#X text 123 247 2.arg: <float> frequency-shift [-];
#X obj 22 185 filter~ ap1c \$1 \$2 1 \$3;
#X text 176 385 IEM KUG;
#X text 160 373 musil;
#X text 190 373 @;
#X text 196 373 iem.at;
#X text 111 362 (c) Thomas Musil 2000 - 2005;
#X text 159 395 Graz \, Austria;
#X connect 0 0 23 0;
#X connect 1 0 14 0;
#X connect 1 0 23 1;
#X connect 4 0 17 0;
#X connect 4 0 23 4;
#X connect 11 0 23 2;
#X connect 23 0 2 0;
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