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/usr/share/puredata/doc/3.audio.examples/G08.reverb.pd is in puredata-doc 0.47.1-3.

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#X text 286 42 "early echo" generators \, which also increase echo
density. Open one to see what they do.;
#X text 300 115 Get the outputs of the recirculating delays. Add the
inputs to two of them.;
#X text 420 313 Do a power-conserving mix of them in pairs. First combine
(1 \, 2) and (3 \, 4)...;
#X text 402 385 ...then (1 \, 3) and (2 \, 4);
#X text 446 469 The two mixing stages have a combined gain of 2 \,
so the recirculation gain is limited to 0.5.;
#X text 586 542 Put the signals back into the;
#X text 584 557 recirculating delays.;
#X text 29 296 Tap outputs from here.;
#X text 708 381 0 to 100 to control reverb;
#X text 719 396 time.;
#X text 691 364 feedback gain on a scale of;
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#X text 169 155 <-- feedback (100 maximum);
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#X text 342 317 updated for Pd version 0.37-1;
#X text 149 180 <-- open to see how it works;
#X text 34 269 Many improvements are possible. Much better reverberators
can be found in the "extras" library.;
#X text 29 30 Here is a simple recirculating reverberator. "Feedback"
should be between 0 and 100 - if 100 \, the reverberation lasts forever.
;
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