/usr/share/puredata/doc/3.audio.examples/H14.all.pass.pd is in puredata-doc 0.48.1-3.
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#X text 609 405 updated for Pd version 0.39;
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#X text 43 225 <-- compute;
#X text 33 289 index;
#X text 103 17 ALL-PASS FILTERS;
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#X text 13 43 The all-pass filter has a phase response that depends
on its coefficient \, and a flat frequency response. The coefficient
(p) gives the location of the pole. There is a zero at 1/p \, unless
p=0. If p=0 the filter is effectively a one-sample delay. Negative
values of $p$ are allowed \, as long as p is between -1 and 1;
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