PV_HainsworthFoote

An FFT based onset detector UGen using a balance of two features. It is based on work described in Hainsworth (2003), "Techniques for the Automated Analysis of Musical Audio," PhD thesis, University of Cambridge. See especially p. 128. The Hainsworth metric is a modification of the Kullback Liebler distance.

===Examples===

// observe detection
play {
 val sig = Decay.ar(Dust.ar(2), 0.1) * WhiteNoise.ar(0.25)
 val th  = MouseX.kr(0.3, 1.0, lag = 0)
 th.poll(HPZ1.kr(th).abs, "thresh")
 val h   = MouseY.kr(1.0, 0.1, lag = 0)
 val f   = 1 - h
 h.poll(HPZ1.kr(h).abs, "h-f")
 val tr  = PV_HainsworthFoote.ar(FFT(LocalBuf(2048), sig), h, f, thresh = th)
 Seq(sig, SinOsc.ar(440) * Decay.ar(tr * 0.01, 0.1))
}