[PD] vcf~ producing output without input for 0Hz cutoff?

[Peter P.]

Howdy list,

just discovered, that [vcf~] produces output after its input has decayed
for a cutoff frequency of 0Hz, but not for values higher 0.

A minimal working example is attached. Is this behavior known? Could it
be mentioned in the help patch maybe? 

cheersz, P
-------------- next part --------------
#N canvas 416 334 716 365 12;
#X obj 78 213 vcf~ 12;
#X obj 78 131 *~;
#X obj 123 249 env~;
#X floatatom 123 277 5 0 0 3 - - - 0;
#X obj 78 57 phasor~ 300;
#X obj 130 111 line~;
#X msg 188 81 1 \, 0 1000;
#X obj 100 182 line~;
#X obj 317 42 bng 20 250 50 0 empty empty 1.start\ note 0 -10 0 12 #fcfcfc #000000 #000000;
#X obj 526 22 loadbang;
#X msg 526 52 \; pd dsp 1;
#X obj 70 286 env~;
#X floatatom 70 314 5 0 0 3 2.\ observe\ output\ after\ amplitude\ envelope\ has\ finished - - 0;
#X msg 133 151 400 \, 0 1000;
#X text 225 153 setting vcf~ cutoff to 0Hz will make it produce a signal.;
#X connect 0 0 11 0;
#X connect 0 1 2 0;
#X connect 1 0 0 0;
#X connect 2 0 3 0;
#X connect 4 0 1 0;
#X connect 5 0 1 1;
#X connect 6 0 5 0;
#X connect 7 0 0 1;
#X connect 8 0 6 0;
#X connect 8 0 13 0;
#X connect 9 0 10 0;
#X connect 11 0 12 0;
#X connect 13 0 7 0;