/usr/share/puredata/doc/3.audio.examples/reverb-echo.pd is in puredata-doc 0.48.1-3.
This file is owned by root:root, with mode 0o644.
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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 118 224 600 492 12;
#X obj 66 95 inlet~;
#X obj 130 96 inlet~;
#X obj 68 216 outlet~;
#X obj 141 215 outlet~;
#X obj 67 143 +~;
#X obj 140 141 -~;
#X obj 141 165 delwrite~ \$1 \$2;
#X obj 140 191 delread~ \$1 \$2;
#X text 48 14 This appears as an abstraction in patch G08.reverb.pd
;
#X text 27 267 This network makes two copies of the (stereo) input
\, one in phase \, the other out of phase and delayed. The total frequency
response is flat. The total signal power out is exactly twice that
of the input \, no matter what frequencies the input contains. This
is used to increase echo density \, by stacking several of these units
with different delay times. Each stage doubles the echo density.;
#X connect 0 0 4 0;
#X connect 0 0 5 0;
#X connect 1 0 4 1;
#X connect 1 0 5 1;
#X connect 4 0 2 0;
#X connect 5 0 6 0;
#X connect 7 0 3 0;
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