/usr/share/puredata/doc/3.audio.examples/H14.all.pass.pd is in puredata-doc 0.45.4-1.
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#X text 691 145 frequency;
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#X text 31 219 values in number boxes.;
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#X text 44 202 <-- compute;
#X text 34 266 index;
#X text 104 -6 ALL-PASS FILTERS;
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#X text 14 20 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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