VST plugin does not "release" when gate is released.

[agdsat134]

VST plugins don't have a release time when using an envelope (see example.) Instead, it just cuts off immediately after the note is let up.

Platform: Windows 10 using FL Studio 20

Steps to reproduce: Export the following plugin as a Windows 64 > VST and run it in a DAW.

import("stdfaust.lib");

gate = button("gate");

process = 
    os.osc(
        nentry("freq", 0, 0, 1000, 1)
    )
    * en.asr(0.15, 1, 3, gate)
    * 0.15
    <: _, _
;