class:: Decay2
summary:: Exponential decay
related:: Classes/Decay
categories::  UGens>Filters>Linear, UGens>Envelopes


Description::
link::Classes/Decay::  has a very sharp attack and can produce clicks.
Decay2 rounds off the attack by subtracting one Decay from another.
code:: Decay2.ar(in, attackTime, decayTime):: is equivalent to:

code::
Decay.ar(in, decayTime) - Decay.ar(in, attackTime)
::


classmethods::

method::ar, kr

argument::in

The input signal.


argument::attackTime

60 dB attack time in seconds.


argument::decayTime

60 dB decay time in seconds.


argument::mul

argument::add


Examples::

code::
// since attack and decay are a difference of two Decays,
// swapping the values, the envelope turns upside down:
plot({ Decay2.ar(Impulse.ar(1), 0.001, 0.01) })
plot({ Decay2.ar(Impulse.ar(1), 0.01, 0.001) })

// used as an envelope
{ Decay2.ar(Impulse.ar(XLine.kr(1,50,20), 0.25), 0.01, 0.2, FSinOsc.ar(600)) }.play;

// compare the above with Decay used as the envelope
{ Decay.ar(Impulse.ar(XLine.kr(1,50,20), 0.25), 0.2, FSinOsc.ar(600), 0)  }.play;
::