Linen

A linear ASR-type envelope generator UGen.

===Examples===

// repeated trigger
play {
 val gen = Linen.kr(Impulse.kr(2), 0.01, 0.6, 1.0)
 SinOsc.ar(440) * gen * 0.1
}

// play once and end the synth
play {
 val gen = Linen.kr(Impulse.kr(0), 0.01, 0.6, 1.0, doneAction = freeSelf)
 SinOsc.ar(440) * gen * 0.1
}

// play once and sustain
val x = play {
 val gen = Linen.kr("gate".kr(1), 0.01, 0.6, 1.0, doneAction = freeSelf)
 SinOsc.ar(440) * gen * 0.1
}

x.release(4)    // release envelope with given duration

// longer gate to sustain for a given duration
play {
 val gate = Trig.kr(1, dur = 2)
 val gen = Linen.kr(gate, 0.01, 0.6, 1.0, doneAction = freeSelf)
 SinOsc.ar(440) * gen * 0.1
}