threshold limit value for the mic?

Hello community,

I have a nice setting for my microphone on adobe audition 6. But I have one big problem.

How can I setup a threshold limit value for the microphone voice? The issue is, that I have all my ambient noises on the recording, so I need a "minimum" activation line. (the same as the "speech activation" in teamspeak 3). There must be a limit and noises under this limit have to be ignored/not recorded.

I hope you know what I mean.

Thanks in advance for any help and best greetings from Germany.

Merciless