

If you are using Lion, the Preferences folder is hidden by default (to keep us from breaking our computer) - you can easily get to the Preferences folder by clicking GO in the Finder Menu, then holding the OPTION key on your keyboard - "Preferences" should then appear in the GO menu for you to click on.
GOOGLE TALK PLUGIN FOR MAC MAC
In your Mac Finder, go to ~/Library/Preferences - (/Users/YourUserName/Library/Preferences) Here is how you can disable the automatic microphone volume adjustment for Google Talk / Google Chat on your Mac: Even if you adjust the Mic input volume in the Mac Sound Preferences manually back down to an acceptable level, the volume will automatically increase as soon as you look away - and disabling the "Use ambient noise reduction", contrary to what is posted at other websites, does not work. This is usually too loud for the person you are chatting with and can also cause other problems such as feedback and sound cutouts. This issue causes the input volume (gain) on your microphone to automatically increase as you speak until it maxes out at 100%. If you use Google Talk or Google Chat to make phone calls or voice chat with your friends on your Mac, you may have run into the "automatic mic input volume" issue.
