[web-audio-api] A NoiseGate/Expander node would be a good addition to the API. (#13)

> Originally reported on W3C Bugzilla [ISSUE-19977](https://www.w3.org/Bugs/Public/show_bug.cgi?id=19977) Fri, 16 Nov 2012 00:20:11 GMT
> Reported by Chris Wilson
> Assigned to 

One of the few node types I've been sorely missing, that could be implemented in JS but with needless latency, is a noise gate/expander node.

Would need standard noise gate controls: threshold, attack, release, hold, and possibly an attenuation setting, maybe even hysteresis control.  Additionally, an AudioNode output of the attenuation would be very helpful for doing sidechain gating.

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https://github.com/WebAudio/web-audio-api/issues/13