/usr/lib/pd/extra/rtc/note2frq-help.pd is in pd-rtclib 4.1-2.
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 1 48 501 340 10;
#X floatatom 36 242 4 0 0 0 - - -;
#X floatatom 176 143 4 0 0 0 - - -;
#X obj 176 170 / 100;
#X msg 102 87 frq2note;
#X text 30 23 note2frq;
#X text 30 55 Converts a note (= MIDI key number or MIDI cents) into
frequency.;
#X text 36 88 see also:;
#X text 32 278 1994-98 by Karlheinz Essl;
#X floatatom 36 114 4 0 0 0 - - -;
#X obj 36 212 note2frq;
#X floatatom 36 145 4 0 0 0 - - -;
#X text 102 244 frequency;
#X text 72 113 MIDI key number;
#X text 72 144 note name;
#X msg 404 29 Harmony;
#X text 208 142 MIDI cents;
#X text 32 292 vs. 1.1;
#X connect 1 0 2 0;
#X connect 2 0 9 0;
#X connect 8 0 10 0;
#X connect 9 0 0 0;
#X connect 10 0 9 0;
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