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/usr/lib/pd/extra/ekext/hssc~-help.pd is in pd-ekext 0.1.1-2.

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#N canvas 0 22 450 300 graph1 0;
#X array play-01 209416 float 0;
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#X msg 201 151 read -resize \$1 play-01;
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#X obj 62 77 tabplay~ play-01;
#X obj 62 134 outlet~;
#X obj 248 183 / 1024;
#X obj 272 213 i;
#X obj 393 229 outlet;
#X msg 272 229 \; hssc resize \$1 \; sssc resize \$1 \; pointer resize
\$1;
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#X text 421 275 The highest significant spectral component is defined
as the highest frequency bin of a discrete Fourier transform with an
amplitude equal to the strongest component divided by the hssc ratio
\, input to the third inlet of the object.;
#X text 421 325 It may be used to trace the extent of high frequencies
in the input relative to prominent components \, a sort of spectral
envelope...;
#X text 325 367 between highest significant spectral component and
strongest significant spectral component;
#X text 7 381 IN HERE--->;
#X msg 559 448 \; pd dsp 1 \; bang-load bang;
#X text 562 432 start here;
#X text 563 489 then hit play;
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