Detecting microphone activity

I found this on the Adobe website:

Programming ActionScript 3.0 > Working with sound > Capturing sound input > Detecting microphone activity

http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00000301.html

It’s still in the Flash 9 documentation, but might be useful for a simple sound detection application.