/usr/share/puredata/doc/3.audio.examples/filter-graph2.pd is in puredata-doc 0.48.1-3.
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#X text 257 102 test sinusoid:;
#X text 272 116 cos;
#X text 325 115 sin;
#X text 397 97 output of filter;
#X text 398 113 we're testing;
#X text 31 103 index and time to next step;
#X text 39 82 ----- from filter-graph1's 3 outlets: -------;
#X text 117 193 low-pass filters;
#X text 118 177 cutoff freq. for;
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#X text 583 184 clear filters;
#X text 582 198 to start;
#X text 578 452 check if any table;
#X text 577 467 is specified for phase;
#X text 577 483 (don't compute it if;
#X text 578 498 not.);
#X text 31 3 filter-graph2: measures frequency and phase response of
a filter \, which should be driven by a "filter-graph1" object. We
need the three outputs of filter-graph1 \, plus the filter output.
;
#X text 438 55 1: table name for frequency response;
#X text 518 39 creation arguments:;
#X text 438 71 2 (optional): table name for phase response;
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