Actually, if you are having no problems with the mic volume, you should get audible recorded volume with your headset. One thing to understand is that, this is kind of a software fix. On my computer, the values are “100” and “+30.0” Db respectively. Setting the values to maximum, generally increases the mic volume.
On the “ Levels” tab, you can change both the options. Related : How to Record Computer Screen in Windows 7 in MP4 or FLV or GIF or WMV etc.