/usr/lib/pd/extra/fftease/crossx~-help.pd is in pd-fftease 2.5.2.git20121005-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | #N canvas 684 407 470 320 10;
#X obj 25 189 dac~;
#N canvas 0 22 470 320 rich-harmonic-source 0;
#X obj 127 232 outlet~;
#X obj 127 125 phasor~ 100;
#X obj 212 126 phasor~ 125;
#X obj 296 125 phasor~ 150;
#X obj 127 183 *~ 0.3;
#X floatatom 127 67 5 0 0 0 - - -;
#X obj 212 99 * 1.25;
#X obj 296 100 * 1.5;
#X obj 130 34 hsl 128 15 60 600 0 0 empty empty empty -2 -6 0 8 -154413
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#X restore 25 23 pd rich-harmonic-source;
#X floatatom 91 66 5 0 0 0 - - -;
#N canvas 179 221 657 470 vocal-source 0;
#X text 13 300 try a vocal sound or other sound with strong formant
structure;
#X obj 31 194 soundfiler;
#X obj 31 160 openpanel;
#N canvas 0 22 450 300 graph1 0;
#X array crossx-sound1 4e+06 float 2;
#X coords 0 1 4e+06 -1 200 140 1;
#X restore 237 13 graph;
#X msg 31 131 bang;
#X obj 227 284 outlet~;
#X msg 227 244 bang;
#X obj 348 228 spigot;
#X obj 385 205 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1
1;
#X text 63 132 open the sound;
#X text 133 244 then play it;
#X text 304 190 loop if you like;
#X msg 31 177 read -resize \$1 crossx-sound1;
#X obj 227 268 tabplay~ crossx-sound1;
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#X restore 58 45 pd vocal-source;
#X msg 186 229 \; pd dsp \$1;
#X obj 186 208 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X obj 25 160 *~ 1;
#X floatatom 48 141 5 0 0 0 - - -;
#X text 90 143 <- might need large amplitude;
#X text 96 155 but watch for sudden spikes!;
#X text 133 70 <- synthesis advancement threshold;
#N canvas 172 351 466 316 crossx-block 0;
#X obj 161 178 outlet~;
#X obj 161 49 inlet~;
#X obj 219 100 inlet;
#X obj 283 102 inlet;
#X obj 161 213 block~ 256;
#X obj 190 80 inlet~;
#X obj 161 132 crossx~ 4;
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#X connect 5 0 6 1;
#X connect 6 0 0 0;
#X restore 25 88 pd crossx-block;
#N canvas 0 22 458 308 messages 0;
#X obj 56 233 outlet;
#X msg 56 175 autonorm \$1;
#X text 56 66 frame normalization to tame amplitude spikes;
#X obj 209 217 fftease-system;
#N canvas 0 22 458 308 rescale-autonorm 0;
#X obj 93 30 inlet;
#X obj 61 92 t b b;
#X msg 61 115 1;
#X msg 108 118 0.05;
#X obj 108 144 s output-gain;
#X obj 96 221 outlet;
#X obj 197 49 inlet;
#X obj 226 102 t b b;
#X obj 243 237 s output-gain;
#X msg 313 130 0;
#X msg 243 211 5;
#X obj 261 174 pipe 100;
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#X obj 48 118 r output-gain;
#X text 96 170 a compressor could be useful here;
#X obj 215 51 hsl 128 15 0 0.05 0 0 empty empty empty -2 -6 0 8 -191432
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#X text 26 262 crossx~ is related to xsyn~ but uses a threshold to
determine whether to perform spectral multiplication or maintain the
last calculated amplitude/phase pair. crossx~ is also somewhat less
CPU intensive.;
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