> Sound.SC3.UGen.Help.viewSC3Help "IEnvGen"
> Sound.SC3.UGen.DB.ugenSummary "IEnvGen"

> import Sound.SC3.ID

> let {l = [0,0.6,0.3,1.0,0]
>     ;t = [0.1,0.02,0.4,1.1]
>     ;c = [EnvLin,EnvExp,EnvNum (-6),EnvSin]
>     ;e = Envelope l t c Nothing Nothing
>     ;x = mouseX KR 0 (sum t) Linear 0.2
>     ;g = iEnvGen KR x e
>     ;o = sinOsc AR (g * 500 + 440) 0 * 0.1}
> in audition (out 0 o)

index with an SinOsc ... mouse controls amplitude of SinOsc
use offset so negative values of SinOsc will map into the Env

> let {l = [-1,-0.7,0.7,1]
>     ;t = [0.8666,0.2666,0.8668]
>     ;c = [EnvLin,EnvLin]
>     ;e = Envelope l t c Nothing Nothing
>     ;x = mouseX KR 0 1 Linear 0.2
>     ;o = (sinOsc AR 440 0 + 1) * x
>     ;g = iEnvGen AR o e * 0.1}
> in audition (out 0 g)