BPZ2

a special fixed band-pass filter UGen. Implements the formula :

out(i) = 0.5 * (in(i) - in(i-2))

This filter cuts out frequencies around zero Hertz and Nyquist.

===Examples===

// engage with mouse button
play {
 val sig = WhiteNoise.ar(0.5)
 val flt = BPZ2.ar(sig)
 LinXFade2.ar(sig, flt, MouseButton.kr(-1, 1))
}