HELP with increasing microphone array sensitivity on the Dell XPS M1330

Hi all,

 

I have a brand new XPS M1330. No matter how I seem to adjust the settings of the microphone array, it never reaches an acceptable level of sensitivity. I am not able to hold video calls over the internet because the folks at the other end can't hear me unless I get really close and talk loudly.

 

Can someone tell me what exactly I must do/what settings I must modify to increase its sensitivity? I have already tried a lot of combinations of settings from the control panel for rectifying this.

 

Thanks.