I'm sorry you are having problems with getting audio in your video recordings. The new video recording features in Snagit 11 are sweet so lets see if we can get you working. Are you not seeing any recording devices in the video drop down for audio?
This menu should allow you to select a recording device. Snagit also remembers your last used audio device so you shouldn't need to select it every time.
Thanks for trying out Snagit 11. We really appreciate your feedback and love to help. Let us know if this helps or if you are still having issues.