Hi,
I use windows XP SP2.
I have onboard sound and Camtasia was not recording it.
I downloaded new drivers from the Realtek site, and the AC97 program, and the other thing, which was only 100kb or something, didn't use it.
I installed the new drivers and the new AC97 or whatever they are.
Didn't work, but what did work was I plugged my microphone into the rear yellow panel. Now, the Realtek Control Panel sensed this, and then asked me which jack I just plugged into.
I did *NOT* select the microphone jack, I selected the line out (or the line in I can't remember) jack. It said that this device is not supported or something, and now I will show you a screenshot of what the Realtek Control Panel "audio i/o" looks like (It now has red/white arrows on it I don't think it had those before):
It now records sound with Camtasia,
Audacity and other programs I'm sure.
I didn't have this problem with my older PC which had onboad sound from nvidia (but no realtek programs so something different).
I think that plugging in a mic gets the hardware to "turn on the recording" or something but use at your own risk. I will be using it! Or it's something that should have been there the whole time it's just part of the design to save power or annoy us or whatever!