I think 1AVCapture might solve your problem. It will capture your full screen or a region of it, you can set the frame-rate so that it doesn’t interfere with your gaming, you can record audio from the ‘what you hear’ audio-line, and it will remain stealth while recording being commanded by hotkeys. Compression formats include all codecs you have installed or directly to WMV.
I recommend camtasia… I’ve used the other ones before but for some reason the audio wasn’t in sync with the video but with camtasia everything was in sync and smooth. It does depend on ya comp specs though… so just give it a try ;p
What are your Audio settings ?
Cause i manage to record sound but a very crappy quality i tried to change the sample from 11025 Hz to the others but it’s not better i ve also changed the 2/4 point but…nothing is better