Onboard sound devices are not sound cards... they are sound chips. Although sound chips may work for playback and recording... they are subjected to other issues that might cause a recording software issues.
Depending on your version of Audio Cleaning Lab, you will need to go to the settings dialog. I think pressing "R" on the computer keyboard will open up those parameters. From there you select the correct driver for your sound device under Audio Input. The correct driver should have the name of the onboard device, if it is a Gigabyte HD sound or Realtek AC 97... I couldn't tell you.
I believe this will also have something to do with the Windows Operating System you are using.