/usr/lib/puredata/extra/pd~/pd~-subprocess.pd is in puredata-extra 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 56 57 58 59 60 | #N canvas 1233 66 646 598 12;
#X obj 202 395 r foo;
#X obj 202 423 print foo;
#X obj 87 174 adc~;
#X obj 72 442 stdout;
#X msg 72 364 a b c;
#X msg 455 441 \; pd dsp 1;
#X obj 87 201 env~ 8192;
#X floatatom 87 250 5 0 0 0 - - -, f 5;
#X obj 87 226 i;
#X obj 263 253 dac~;
#X obj 262 185 osc~ 440;
#X obj 262 219 *~;
#X obj 297 220 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1
1;
#X obj 332 186 osc~ 440;
#X obj 332 220 *~;
#X obj 367 221 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X msg 86 411 bang;
#X obj 455 417 loadbang;
#X obj 160 201 env~ 8192;
#X floatatom 160 250 5 0 0 0 - - -, f 5;
#X obj 160 226 i;
#X msg 86 388 4;
#X text 62 8 This is a test patch to demonstrate the Pd~ object. It's
intended as the patch to run in the sub-process. The sub-process (which
is a separate instance of Pd) can be called from a Max or Pd super-process.
;
#X text 63 73 Audio inlets and outlets on the Pd~ object (in the super-process)
talk to adc~ and dac~ objects here - so \, for instance \, the first
adc~ here is the first inlet of the pd~ object \, and the first chanel
of dac~ goes to the second outlet of pd~ (because the first one is
for messages \, as shown further below.);
#X text 58 283 Any message sent to a stdout object in this sub-process
(below) appears on the first \, message outlet of the pd~ object in
the super-process. The super-process can send messages to any "receive"
object in this sub-process.;
#X text 137 478 We turn DSP on at load for convenience - control objects
in this patch will still work without it (unlike in the super-process
\, where DSP must be on for time to move forward in the sub-process.)
;
#X text 351 538 Updated for Pd version 0.42.;
#X connect 0 0 1 0;
#X connect 2 0 6 0;
#X connect 2 1 18 0;
#X connect 4 0 3 0;
#X connect 6 0 8 0;
#X connect 8 0 7 0;
#X connect 10 0 11 0;
#X connect 11 0 9 0;
#X connect 12 0 11 1;
#X connect 13 0 14 0;
#X connect 14 0 9 1;
#X connect 15 0 14 1;
#X connect 16 0 3 0;
#X connect 17 0 5 0;
#X connect 18 0 20 0;
#X connect 20 0 19 0;
#X connect 21 0 3 0;
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