/usr/share/puredata/doc/3.audio.examples/A03.line.pd is in puredata-doc 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 48 49 50 51 52 53 54 55 | #N canvas 369 106 647 598 12;
#X obj 56 79 osc~ 440;
#X obj 56 309 dac~;
#X msg 446 79 \; pd dsp 1;
#X msg 538 79 \; pd dsp 0;
#X text 467 112 ON;
#X text 555 112 OFF;
#X obj 56 269 *~;
#X obj 72 243 line~;
#X text 129 243 <--- ramp generator;
#X text 132 78 <-- sine wave;
#X msg 72 103 0.1 2000;
#X msg 72 177 0 2000;
#X msg 72 125 0.1 50;
#X msg 72 199 0 50;
#X msg 72 147 0.1;
#X msg 72 221 0;
#X text 274 124 ON;
#X text 154 105 <-- slow;
#X text 144 126 <-- fast;
#X text 111 146 <-- instantly;
#X text 271 197 OFF;
#X text 136 178 <-- slow;
#X text 129 199 <-- fast;
#X text 109 219 <-- instantly;
#X text 112 161 ----------------------;
#X text 97 308 <-- out;
#X text 103 7 CONTROLLING AMPLITUDE USING LINE~;
#X text 38 342 Line~'s left inlet is a target value \; it reaches that
target in the time specified (in milliseconds) to its right inlet.
;
#X text 34 495 The line~ object (and its control brother \, line) treat
their right inlet specially. The inlets don't retain values the way
other inlets do but revert to zero whenever a target is received.;
#X text 14 27 In this patch \, the multiplier is configured to multiply
two signals. The amplitude is now a signal computed by the line~ object.
;
#X text 37 395 (In this example \, message boxes with two numbers each
are connected to line~'s left inlet. Except in some special cases \,
Pd objects with more than one inlet will automatically distribute lists
of numbers across their inlets. In this case \, "0 50" becomes \, "50
at right and 0 at left.");
#X text 386 557 updated for Pd version 0.36;
#X text 93 268 <-- multiply the sine wave by the ramp. There's no longer
a "0" argument-- this tells Pd to expect a signal here.;
#X connect 0 0 6 0;
#X connect 6 0 1 0;
#X connect 6 0 1 1;
#X connect 7 0 6 1;
#X connect 10 0 7 0;
#X connect 11 0 7 0;
#X connect 12 0 7 0;
#X connect 13 0 7 0;
#X connect 14 0 7 0;
#X connect 15 0 7 0;
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