Decay has a very sharp attack and can produce clicks. Decay2 rounds off the attack by subtracting one Decay from another. Decay2.ar(in, attackTime, decayTime) is equivalent to:
| in | 
 The input signal.  | 
| attackTime | 
 60 dB attack time in seconds.  | 
| decayTime | 
 60 dB decay time in seconds.  | 
| mul | |
| add |