LeakDC

A filter UGen to remove very low frequency content DC offset.

This is a one-pole highpass filter implementing the formula

y[n] = x[n] - x[n-1] + coeff * y[n-1]

===Examples===

// show DC with mouse-controlled coefficient
play {
 val freq = 800
 val in   = LFPulse.ar(freq).mulAdd(0.5, 0.5)
 val coef = MouseX.kr(0.9, 0.999)
 val flt  = LeakDC.ar(in, coef)
 val dc   = RunningSum.ar(flt, SampleRate.ir/freq)
 coef.poll(2)
 dc  .poll(2)
 0
}