/usr/share/puredata/doc/5.reference/acoustics-help.pd is in puredata-core 0.46.7-3.
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 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 | #N canvas 0 466 571 483 12;
#X obj 32 393 ftom;
#X obj 8 10 mtof;
#X obj 32 341 mtof;
#X floatatom 32 313 0 0 0 0 - - -;
#X floatatom 32 368 0 0 0 0 - - -;
#X obj 64 10 ftom;
#X floatatom 32 417 0 0 0 0 - - -;
#X obj 120 11 dbtorms;
#X obj 196 11 rmstodb;
#X obj 275 11 dbtopow;
#X obj 352 11 powtodb;
#X floatatom 164 309 0 0 0 0 - - -;
#X floatatom 164 364 0 0 0 0 - - -;
#X floatatom 164 413 0 0 0 0 - - -;
#X obj 164 337 dbtorms;
#X obj 164 389 rmstodb;
#X floatatom 278 310 0 0 0 0 - - -;
#X floatatom 278 365 0 0 0 0 - - -;
#X floatatom 278 414 0 0 0 0 - - -;
#X obj 278 338 dbtopow;
#X obj 278 390 powtodb;
#X text 23 245 Finally \, dbtopow and powtodb convert decibels to and
from power units \, equal to the square of the "RMS" amplitude.;
#X text 304 448 updated for pd version 0.40.;
#X text 21 53 The mtof object transposes a midi value into a frequency
in Hertz \, so that "69" goes to "440". You can specify microtonal
pitches as in "69.5" (a quarter tone higher than 69). Ftom does the
reverse. A frequency of zero Hertz is given a MIDI value of -1500 (strictly
speaking \, it is negative infinity.);
#X text 22 149 The dbtorms and rmstodb objects convert from decibels
to linear ("RMS") amplitude \, so that 100 dB corresponds to an "RMS"
of 1 Zero amplitude (strictly speaking \, minus infinity dB) is clipped
to zero dB \, and zero dB \, which should correspond to 1e-04 in "RMS"
\, is instead rounded down to zero.;
#X connect 0 0 6 0;
#X connect 2 0 4 0;
#X connect 3 0 2 0;
#X connect 4 0 0 0;
#X connect 11 0 14 0;
#X connect 12 0 15 0;
#X connect 14 0 12 0;
#X connect 15 0 13 0;
#X connect 16 0 19 0;
#X connect 17 0 20 0;
#X connect 19 0 17 0;
#X connect 20 0 18 0;
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