There are some flash settings you can try. When you start recording right click on the flash window. A flash properties box should popup. There you can change what flash uses for a webcam and mic

You may also want to check your audio settings in windows or whatever os you use and see if your webcam mic is set as the default mic.

This may be just a matter of the system defaulting to the built in audio system
I tried that hon, nothing worked for me.
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