/usr/share/puredata/doc/5.reference/delread4~-help.pd is in puredata-core 0.48.1-3.
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 | #N canvas 395 121 628 486 12;
#X floatatom 58 275 0 0 1000 0 - - -;
#X text 166 394 signal output (delayed signal);
#X text 128 327 signal input (delay time in ms);
#X text 262 359 creation argument: name of delay line;
#X text 44 442 see also:;
#X obj 132 445 delwrite~;
#X obj 221 444 delread~;
#X obj 28 17 delread4~;
#X text 37 85 delread4~ implements a 4-point interpolating delay tap
from a corresponding delwrite~ object. The delay in milliseconds of
the tap is specified by the incoming signal.;
#X text 140 12 read a signal from a delay line at a variable delay
time (4-point-interpolation), f 44;
#X obj 30 52 vd~;
#X text 72 53 old \, slightly rude synonym;
#X text 383 440 updated for Pd version 0.47;
#X text 38 139 The delay time is always at least one sample and at
most the length of the delay line (specified by a corresponding delwrite~).
In addition \, in case the delwrite~ runs later in the DSP loop than
the delread4~ \, the delay is constrained below by one vector length
(64 samples.) An example showing how to control this to obtain very
short delays is included in doc/3.audio.examples/G05.execution.order.pd
;
#X obj 58 360 delread4~ \$0-delay;
#X obj 419 307 delwrite~ \$0-delay 1000;
#X obj 59 303 pack 0 1000;
#X obj 59 328 line~;
#X obj 419 282 osc~ 440;
#X obj 57 386 out1~;
#X connect 0 0 16 0;
#X connect 14 0 19 0;
#X connect 16 0 17 0;
#X connect 17 0 14 0;
#X connect 18 0 15 0;
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