/usr/lib/pd/extra/rtc/crossfade~-help.pd is in pd-rtclib 4.1-1.
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 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | #N canvas 251 120 570 535 10;
#X text 80 187 signal 2;
#X msg 207 476 RTC-Overview;
#X msg 378 33 MSP-RTC;
#X text 26 502 1999 by Gerhard Eckel & Karlheinz Essl;
#X text 24 66 Crossfades two input signals according to a sine function
which guarantees that loudness of the result is constant.;
#X text 24 34 crossfade~;
#X floatatom 113 267 5 0 0 0 - - -;
#X obj 116 244 hsl 128 15 0 127 0 0 empty empty crossfader -2 -8 0
10 -262144 -1 -1 0 1;
#X obj 48 307 crossfade~;
#X obj 48 335 *~ 0.5;
#X text 44 130 signal 1;
#X obj 81 204 osc~ 800;
#X obj 48 150 osc~ 400;
#X obj 284 289 vu 15 120 empty empty -1 -8 0 8 -66577 -1 1 0;
#X obj 241 369 env~;
#X obj 241 394 - 100;
#N canvas 97 74 495 413 linear 0;
#X obj 135 165 expr 1-$f1 \; $f1;
#X obj 136 142 / 127;
#X obj 73 212 *~;
#X obj 110 214 *~;
#X obj 74 293 env~;
#X obj 74 318 - 100;
#X obj 74 268 +~;
#X obj 74 58 inlet~;
#X obj 109 82 inlet~;
#X obj 136 122 inlet;
#X text 42 28 This linear fading has a "hole in the middle" effect
;
#X obj 74 342 outlet;
#X connect 0 0 2 1;
#X connect 0 1 3 1;
#X connect 1 0 0 0;
#X connect 2 0 6 0;
#X connect 3 0 6 1;
#X connect 4 0 5 0;
#X connect 5 0 11 0;
#X connect 6 0 4 0;
#X connect 7 0 2 0;
#X connect 8 0 3 0;
#X connect 9 0 1 0;
#X restore 376 243 pd linear;
#X obj 377 288 vu 15 120 empty empty -1 -8 0 8 -66577 -1 1 0;
#X obj 47 413 *~ 0;
#X obj 73 373 hsl 128 15 0 127 0 0 empty empty empty -2 -8 0 10 -262144
-1 -1 7600 1;
#X obj 70 393 dbtorms;
#X obj 47 437 dac~;
#X text 369 212 "hole in middle";
#X text 125 305 arg1: 0-127;
#X connect 6 0 8 2;
#X connect 6 0 16 2;
#X connect 7 0 6 0;
#X connect 8 0 9 0;
#X connect 8 0 14 0;
#X connect 9 0 18 0;
#X connect 11 0 8 1;
#X connect 11 0 16 1;
#X connect 12 0 8 0;
#X connect 12 0 16 0;
#X connect 14 0 15 0;
#X connect 15 0 13 0;
#X connect 16 0 17 0;
#X connect 18 0 21 0;
#X connect 18 0 21 1;
#X connect 19 0 20 0;
#X connect 20 0 18 1;
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