// DC blocker example: you won't be able to hear this, but
// you can see the very low frequencies being reduced 
// in the audicle

// patch
SinOsc s => dac;
// freq
.1 => s.freq;

// wait
2::second => now;

// insert filter
s =< dac;
s => PoleZero pz => dac;

// play pole at .999
.999 => pz.blockZero;

// go
while( true ) 1::second => now;