hsc3-0.11: Help/UGen/Envelope/envADSR.help.lhs
> Sound.SC3.UGen.Help.viewSC3Help "Env.*adsr"
> :t envADSR
> import Sound.SC3
> let {g = control KR "gate" 1
> ;p = envADSR 0.75 0.75 0.5 0.75 1 (EnvNum (-4)) 0
> ;e = envGen KR g 0.1 0 1 DoNothing p}
> in audition (out 0 (sinOsc AR 440 0 * e))
> withSC3 (\fd -> send fd (n_set1 (-1) "gate" 0))
> withSC3 (\fd -> send fd (n_set1 (-1) "gate" 1))
> withSC3 (\fd -> send fd (n_free [-1]))