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

# SC3
SC3 reorders inputs so that the envelope is the first argument.

The following envelope constructors are provided: envPerc, envSine,
envCoord, envTrapezoid, and envLinen.

> import Sound.SC3.ID

env_circle joins the end of the envelope to the start
> let {e = Envelope [6000,700,100] [1,1] [EnvExp,EnvLin] Nothing Nothing
>     ;f = envGen KR 1 1 0 1 DoNothing (env_circle e 0 EnvLin)
>     ;o = sinOsc AR f 0 * 0.1 + impulse AR 1 0}
> in audition (out 0 o)

Env([6000,700,100],[1,1],['exp','lin']).circle.asArray
> let {e = Envelope [6000,700,100] [1,1] [EnvExp,EnvLin] Nothing Nothing
>     ;r = [0,4,3,0,6000,0,1,0,700,1,2,0,100,1,1,0,0,9e8,1,0]}
> in envelope_sc3_array (env_circle e 0 EnvLin) == Just r

Env([0,1],[0.1]).asArray == [0,1,-99,-99,1,0.1,1,0]
> let e = (Envelope [0,1] [0.1] [EnvLin] Nothing Nothing)
> in envelope_sc3_array e == Just [0,1,-99,-99,1,0.1,1,0]

https://www.listarc.bham.ac.uk/lists/sc-users/msg14815.html
> let {n = range 0.01 0.1 (lfNoise1 'α' KR 2)
>     ;e = Envelope [0,1] [n] [EnvLin] Nothing (Just 0)
>     ;a = envGen AR 1 1 0 1 DoNothing (env_circle e 0 EnvLin)
>     ;o = sinOsc AR (a * 400 + 500) 0 * 0.1}
> in audition (out 0 o)