/usr/lib/pd/extra/pdp/pdp_mix-help.pd is in pd-pdp 1:0.14.1-1.
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 | #N canvas 314 353 576 288 10;
#X obj 103 132 pdp_reg;
#X obj 201 86 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X floatatom 200 155 5 0 0;
#X obj 81 48 pdp_help_input;
#X msg 81 18 start;
#X msg 130 18 stop;
#X obj 81 238 pdp_help_output;
#X text 268 80 click here;
#X obj 81 184 pdp_mix;
#X text 268 159 crossfade between 2 packets;
#X text 268 175 0 = left inlet \, 1 = middle inlet;
#X connect 0 0 8 1;
#X connect 1 0 0 0;
#X connect 2 0 8 2;
#X connect 3 0 0 1;
#X connect 3 0 8 0;
#X connect 4 0 3 0;
#X connect 5 0 3 0;
#X connect 8 0 6 0;
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