There's a property in the MicrophoneEnhancedOptions class called autoGain. It's undocumented but it's mentioned in a few places, plus Flash Builder displays it in its code completion pop-ups. I tried setting it to true and then assigning the MicrophoneEnhancedOptions to my instance of the EnhancedMicrophone class but the property stays at false.
So the question is this: Does MicrophoneEnhancedOptions.autoGain do anything and if so, how can I take advantage of it? Having the mic adjust its gain automatically would be nice.