/usr/share/puredata/doc/3.audio.examples/A02.amplitude.pd is in puredata-doc 0.47.1-3.
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 | #N canvas 73 190 702 512 12;
#X obj 64 65 osc~ 440;
#X obj 64 283 dac~;
#X text 145 66 <-- 440 Hz. sine wave at full blast;
#X msg 431 7 \; pd dsp 1;
#X msg 514 7 \; pd dsp 0;
#X text 456 45 ON;
#X text 534 43 OFF;
#X text 164 18 CONTROLLING AMPLITUDE;
#X text 35 327 Amplitudes of audio signals can have any reasonable
range \, but when you output a signal via the dac~ object \, the samples
should range between -1 and +1. Values out of that range will be "clipped."
;
#X obj 64 202 *~ 0;
#X floatatom 107 165 0 0 0 0 - - -;
#X obj 95 132 dbtorms;
#X floatatom 95 100 0 0 80 0 - - -;
#X text 141 100 <-- set amplitude here in dB;
#X text 211 133 <-- this converts dB to linear units;
#X text 210 164 <-- this shows the linear gain;
#X text 116 204 <-- multiply the sine wave by the gain \, reducing
its amplitude. You can also use the "*~" object to multiply two signals.
The "0" argument here instructs it that we'll just send it messages
to set the multiplier.;
#X text 35 396 Here we calculate a gain for the multiplier (*~) using
a "dbtorms" object (acronym for "dB to RMS"). 100 dB is normalized
to one \, and zero dB artificially outputs a true 0;
#X text 34 452 Pd assumes you have a two channel audio system unless
you tell it otherwise.;
#X text 440 486 updated for Pd version 0.33;
#X text 114 282 <-- and out. We're sending to both channels now.;
#X connect 0 0 9 0;
#X connect 9 0 1 0;
#X connect 9 0 1 1;
#X connect 11 0 9 1;
#X connect 11 0 10 0;
#X connect 12 0 11 0;
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