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/usr/lib/puredata/doc/3.audio.examples/H15.phaser.pd is in puredata-doc 0.43.0-4.

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#N canvas 25 22 703 596 12;
#X text 448 562 updated for Pd version 0.39;
#X text 167 -1 PHASER;
#N canvas 876 177 375 255 startup 0;
#X obj 22 24 loadbang;
#X obj 22 48 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 22 67 f \$0;
#X text 35 195 This subpatch loads initial;
#X text 31 219 values in number boxes.;
#X msg 22 91 \; \$1-pole 80;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 5 0;
#X restore 323 561 pd startup;
#N canvas 0 0 660 424 chord 0;
#X obj 87 97 -~ 0.5;
#X obj 87 146 clip~ -0.5 0.5;
#X obj 87 169 cos~;
#X obj 91 252 hip~ 5;
#X obj 91 315 outlet~;
#X obj 87 122 *~ 3;
#X obj 87 74 phasor~ 220;
#X obj 221 97 -~ 0.5;
#X obj 221 146 clip~ -0.5 0.5;
#X obj 221 169 cos~;
#X obj 221 122 *~ 3;
#X obj 356 100 -~ 0.5;
#X obj 356 149 clip~ -0.5 0.5;
#X obj 356 172 cos~;
#X obj 356 125 *~ 3;
#X obj 491 100 -~ 0.5;
#X obj 491 149 clip~ -0.5 0.5;
#X obj 491 172 cos~;
#X obj 491 125 *~ 3;
#X obj 221 74 phasor~ 251;
#X obj 356 77 phasor~ 281;
#X obj 491 77 phasor~ 311;
#X text 147 32 test sound for phaser;
#X obj 91 285 *~ 0.2;
#X connect 0 0 5 0;
#X connect 1 0 2 0;
#X connect 2 0 3 0;
#X connect 3 0 23 0;
#X connect 5 0 1 0;
#X connect 6 0 0 0;
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#X connect 8 0 9 0;
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#X connect 10 0 8 0;
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#X connect 12 0 13 0;
#X connect 13 0 3 0;
#X connect 14 0 12 0;
#X connect 15 0 18 0;
#X connect 16 0 17 0;
#X connect 17 0 3 0;
#X connect 18 0 16 0;
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#X connect 20 0 11 0;
#X connect 21 0 15 0;
#X connect 23 0 4 0;
#X restore 73 271 pd chord;
#X obj 72 533 output~;
#X obj 95 325 rpole~;
#X obj 95 300 rzero_rev~;
#X obj 95 374 rpole~;
#X obj 95 349 rzero_rev~;
#X obj 95 422 rpole~;
#X obj 95 397 rzero_rev~;
#X obj 95 471 rpole~;
#X obj 95 446 rzero_rev~;
#X obj 72 501 +~;
#X text 23 17 The phaser ranks \, along with fuzz and wah-wah \, as
one of the great guitar pedals. A phaser simply adds an all-passed
copy of the signal to the original \, making phase reinforcement and
cancellation at frequencies that depend on the all-pass coefficients.
In this example the coefficients range from 0.88 to 0.98 \, controlled
by a phasor~ object (no relation). The phasor~ is converted to a symmetrical
triangle wave (abs($v1-0.5)) and then ranged appropriately.;
#X obj 250 417 phasor~ 0.3;
#X text 22 158 Many variations of this have been invented. A deeper
effect can be obtained by using 12 all-pass filters and adding the
outputs of the 4th \, 8th. and 12th one to the original. Various stereo
configurations are possible. Some people use 6 instead of the 4 stages
used here. Controls can be added to change the frequency of sweeping
and the range of the all-pass coeefficients.;
#X obj 250 449 expr~ 1 - 0.03 - 0.6*abs($v1-0.5)*abs($v1-0.5);
#X connect 3 0 6 0;
#X connect 3 0 13 0;
#X connect 5 0 8 0;
#X connect 6 0 5 0;
#X connect 7 0 10 0;
#X connect 8 0 7 0;
#X connect 9 0 12 0;
#X connect 10 0 9 0;
#X connect 11 0 13 1;
#X connect 12 0 11 0;
#X connect 13 0 4 0;
#X connect 13 0 4 1;
#X connect 15 0 17 0;
#X connect 17 0 6 1;
#X connect 17 0 5 1;
#X connect 17 0 8 1;
#X connect 17 0 7 1;
#X connect 17 0 10 1;
#X connect 17 0 9 1;
#X connect 17 0 12 1;
#X connect 17 0 11 1;