To: Renno
Dear user,
If you need to create the two channel audio from a one channel, you can do it in AVS Audio Editor by following Save - Save as - in the new opened window in Channels drop down list choose Stereo - see the screenshot attached.
The noise in the unregistred version should not be connected to the fact that the program is not activated, there might have been some tecnical problems (may be connection of your microphone) in the unregistered version.
Please let me know if I can be of any further assistance to you.
Kind regards