Add missing delread4~ help patch.

doc/pddp/delread4~-help.pd

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+#X text 12 115 LIBRARY internal;
+#X text 12 155 WEBSITE http://crca.ucsd.edu/~msp/;
+#X text 12 25 LICENSE SIBSD;
+#X text 12 135 AUTHOR Miller Puckette;
+#X text 12 195 HELP_PATCH_AUTHORS Updated for Pd version 0.33. Jonathan
+Wilkes revised the patch to conform to the PDDP template for Pd version
+0.42.;
+#X text 12 5 KEYWORDS signal nonlocal time;
+#X text 12 45 DESCRIPTION read a signal from a delay line at a variable
+delay time;
+#X text 12 75 INLET_0 signal;
+#X text 12 95 OUTLET_0 signal;
+#X text 12 175 RELEASE_DATE 1997;
+#X restore 500 597 pd META;
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+#X obj 22 43 delwrite~;
+#X obj 92 43 delread~;
+#X text 8 2 [vd~] Related Objects;
+#X obj 159 44 delay;
+#X restore 102 597 pd Related_objects;
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+#X obj 324 138 sig~;
+#X text 98 377 signal;
+#X text 98 397 float;
+#X text 98 416 list;
+#X text 11 23 reads a signal from a delay line at a variable delay
+time;
+#X text 98 452 signal;
+#X text 168 452 - the signal from the corresponding [delwrite~] object
+is interpolated and output after the delay specified by the incoming
+signal.;
+#X text 168 515 - the name of the corresponding [delwrite~] object
+;
+#X text 168 416 - a list is truncated to the first element.;
+#X text 168 377 - incoming signal (delay time in ms).;
+#X text 168 397 - delay time in ms.;
+#X text 80 515 1) symbol atom;
+#X obj 101 160 delwrite~ vd~help_example 1000;
+#X floatatom 324 115 5 0 0 0 - - -, f 5;
+#X obj 324 230 snapshot~;
+#X obj 333 204 metro 150;
+#X obj 333 182 loadbang;
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+#X floatatom 101 139 5 0 0 0 - - -, f 5;
+#X msg 369 115 1000;
+#X obj 4 597 pddp/pddplink all_about_help_patches.pd -text Usage Guide
+;
+#X obj 480 53 pddp/dsp;
+#X obj 98 543 pddp/pddplink ../3.audio.examples/G03.delay.variable.pd
+-text doc/3.audio.examples/G03.delay.variable.pd;
+#X obj 98 558 pddp/pddplink ../3.audio.examples/G04.control.blocksize.pd
+-text doc/3.audio.examples/G04.control.blocksize.pd;
+#X obj 98 573 pddp/pddplink ../3.audio.examples/G05.execution.order.pd
+-text doc/3.audio.examples/G05.execution.order.pd;
+#X obj 519 12 vd~;
+#X obj 324 160 delread4~ vd~help_example;
+#X obj 451 12 delread4~;
+#X text 98 67 [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 98 274 The delay time is always at least one sample and at
+most the length of the delay line (specified by [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.)
+;
+#X text 98 343 NOTE: [vd~] old \, slightly rude synonym for [delread4~]
+;
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