I have Windows 10, Windows 8, Windows 7 or Windows Vista and cannot find recording source options I used to have in XP
With windows XP, recording source choices such as "Stereo Mix" and "Mono Mix" are apparent and readily available. Starting with Windows Vista, these choices are "hidden" by default. To enable them you need to unhide them and then enable each device you wish to use.
1. Right-click on the small volume control icon in your Windows task bar and select Recording Devices.
See this short video tutorial which shows exactly how to accomplish this. View Tutorial here