/usr/lib/pd/extra/iemlib/ap1~.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 | #N canvas 256 230 379 285 10;
#X obj 22 42 inlet~;
#X obj 52 65 inlet;
#X obj 22 186 outlet~;
#X text 62 42 ~signal_in~;
#X obj 143 100 inlet;
#X text 178 101 <float> interpolation_time [ms];
#X text 28 157 ~filtered signal_out~;
#X text 66 10 allpass 1.order;
#X obj 22 133 filter~ ap1 \$1 1 0 \$2;
#X text 89 64 <float> -90_degree_frequency [Hz];
#X text 11 9 ap1~;
#X text 84 182 1.arg: <float> -90_degree_frequency [Hz];
#X text 84 193 2.arg: <float> interpolation_time [ms] (opt.);
#X text 176 245 IEM KUG;
#X text 160 233 musil;
#X text 190 233 @;
#X text 196 233 iem.at;
#X text 111 222 (c) Thomas Musil 2000 - 2005;
#X text 159 255 Graz \, Austria;
#X connect 0 0 8 0;
#X connect 1 0 8 1;
#X connect 4 0 8 4;
#X connect 8 0 2 0;
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