/usr/lib/pd/extra/aubio/aubiozcr~-help.pd is in pd-aubio 0.4-1.
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1 2 3 4 5 6 7 8 9 10 11 | #N canvas 0 22 580 309 10;
#X obj 37 71 aubiozcr~;
#X obj 37 43 osc~ 441;
#X floatatom 36 98 5 0 0 0 - - -;
#X text 153 36 aubiozcr~ computes the zero-crossing rate;
#X text 152 95 For a sine tone at 441Hz sampled at 44100Hz signal \,
the ZCR is 0.02.;
#X text 153 59 This value represents the number of times where the
signal changes sign.;
#X connect 0 0 2 0;
#X connect 1 0 0 0;
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