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/usr/lib/pd/extra/pdp/pdp_bq-help.pd is in pd-pdp 1:0.14.1-3+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#N canvas 364 134 765 779 10;
#X floatatom 100 598 5 0 0;
#X msg 28 361 ver \$1;
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#X obj 96 362 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1
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#X obj 28 629 pdp_bq;
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#X msg 410 370 lpf;
#X msg 409 344 hpf;
#X msg 409 398 apf;
#X msg 409 425 bsf;
#X obj 461 38 pdp_help_input;
#X msg 461 13 start;
#X msg 507 13 stop;
#X obj 28 746 pdp_help_output;
#X text 159 598 right inlet sets number of passes;
#X text 37 16 pdp_bq: a spatial biquad filter;
#X obj 495 196 pdp_blur;
#X obj 598 194 pdp_phase;
#X obj 461 93 pdp_route 3;
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#X obj 41 670 r \$0-out;
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#X text 312 358 high pass;
#X text 313 382 low pass;
#X text 314 410 all pass;
#X text 313 439 band stop;
#X text 541 367 pole Q;
#X text 94 31 it is a bit awkward to use directly;
#X text 94 45 try one of the abstractions (pdp_blur and;
#X text 95 61 pdp_phase);
#X text 122 208 left->right;
#X text 124 242 right->left;
#X text 126 272 top->bottom;
#X text 126 300 bottom->top;
#X text 133 359 bt and tb;
#X text 132 383 lr and rl;
#X text 147 494 one pole filter;
#X text 146 524 double one pole filter;
#X msg 89 464 0.1;
#X msg 556 95 0.5;
#X msg 616 94 0.5;
#X text 588 62 choose example here;
#X msg 672 118 1;
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#X msg 712 116 1;
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#X text 93 91 "unstable" behaviour is possible;
#X msg 490 347 0.1;
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#X obj 28 720 pdp_gain;
#X floatatom 112 693 5 0 0;
#X msg 112 671 1;
#X text 95 107 when frequency and Q are outside their;
#X text 96 122 sensible ranges;
#X text 122 180 set filter direction:;
#X text 264 342 set the filter type:;
#X text 137 476 set the filter type:;
#X text 538 319 (between 0 and 1 \, 0.5 = nyquist);
#X text 540 333 comment;
#X text 540 305 pole frequency;
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