A UGen that reads a signal from a control bus and applies a lag filter to it.
This is essentially the same as Lag.kr(In.kr(...), time) .
val c = Bus.control(s)
c.set(30) // initial midi-pitch
val freq = LagIn.kr(c.index, time = 1).midicps
SinOsc.ar(freq) * AmpComp.kr(freq) * 0.1
index of the bus to read from. When numChannels is
greater than one, the other channels or read from the
number of channels to read
60 dB lag time in seconds.