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/usr/lib/pd/extra/purepd/delta~-help.pd is in pd-purepd 0.1.1-2.

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#N canvas 611 272 450 300 10;
#X text 88 22 sample difference;
#X obj 67 202 env~;
#X floatatom 67 230 5 0 0 0 - - -;
#X floatatom 67 124 5 0 0 0 - - -;
#X obj 67 147 osc~ 0.11;
#X text 34 62 outputs the difference between current input and the
;
#X text 35 73 previous sample \, i.e. (3 \, 1 \, 0 -> 3 \, 2 \, -1):
;
#X text 35 300 cyclone is (c) Miller Puckette and others;
#X text 34 316 docs based on the MAX/MSP reference (c) cycling'74;
#X text 33 330 ___________________________________________________
;
#X obj 20 21 delta~;
#X obj 68 175 delta~;
#X connect 1 0 2 0;
#X connect 3 0 4 0;
#X connect 4 0 11 0;
#X connect 11 0 1 0;