/usr/lib/pd/extra/fftease/centerring~-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.
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#N canvas 376 316 462 312 centerring-block 0;
#X obj 163 128 centerring~;
#X obj 233 219 block~ 256;
#X obj 152 180 outlet~;
#X obj 141 63 inlet~;
#X obj 337 89 inlet;
#X obj 195 67 inlet;
#X obj 242 66 inlet;
#X obj 290 71 inlet;
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#X restore 167 141 pd centerring-block;
#X obj 167 195 *~ 1;
#X obj 167 230 dac~;
#X floatatom 190 176 5 0 0 0 - centerring-gain -;
#X msg 333 242 \; pd dsp \$1;
#X obj 333 225 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X obj 18 207 hsl 128 15 0 0.1 0 0 centerring-gain empty output_gain
-2 -6 0 8 -79789 -1 -1 800 1;
#X obj 81 51 phasor~ 150;
#N canvas 0 22 474 324 messages 0;
#X obj 159 192 outlet;
#X msg 154 138 zerophases;
#X msg 263 138 randphases;
#X msg 71 101 seed \$1;
#X floatatom 70 71 5 0 0 0 - - -;
#X msg 117 65 1974;
#X obj 320 168 fftease-system;
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#X restore 319 108 pd messages;
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#X obj 18 240 hsl 128 15 0.1 20 0 0 cr-base-frequency empty base_frequency
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#X floatatom 251 59 5 0 0 0 - cr-bandwidth -;
#X obj 16 271 hsl 128 15 0.1 20 0 0 cr-bandwidth empty bandwidth -2
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#X floatatom 329 42 5 0 0 0 - cr-freq-constant -;
#X obj 15 305 hsl 128 15 0.1 20 0 0 cr-freq-constant empty frequency_constant
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#X obj 9 99 loadbang;
#X msg 9 125 0.1 1 0.15 1;
#X obj 9 157 unpack f f f f;
#X text 171 294 centerring~ performs frequency independent amplitude
modulation upon the spectral magnitudes of input signals. The effect
is somewhat akin to flanging. The base frequency is used to derive
the frequency of an oscillator associated with each frequency band.
The frequency bandwidth and constant control the deviation of a particular
frequency band's modulation oscillator frequency.;
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