/usr/lib/pd/extra/nusmuk-audio/echo~-help.pd is in pd-nusmuk 20151113+repack-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 | #N canvas 231 293 450 300 10;
#X obj 43 53 osc~ 333;
#X obj 118 55 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X obj 42 87 *~;
#X obj 42 150 *~ 0.1;
#X obj 41 182 dac~;
#X obj 58 117 echo~ 555 0.8;
#X text 113 141 parametter 1: echo time (ms);
#X text 113 160 parameter 2 : amplitude attenuation;
#X connect 0 0 2 0;
#X connect 1 0 2 1;
#X connect 2 0 3 0;
#X connect 2 0 5 0;
#X connect 3 0 4 0;
#X connect 3 0 4 1;
#X connect 5 0 3 0;
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