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Detecting input volume level using Java Sound API

I'm using the Java Sound API to record user speech. I would like to be able to determine when the input volume reaches a certain level (when the user starts speaking) and also when it then retreats back to near silence (when the user stops speaking).

This is essentially the same question as this one, however I have discovered that the getLevel() method isn't actually implemented and hence require an alternative solution.

Can anyone point me in the right direction?

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