There are four drop-down lists located above the middle of the program window. You can select the settings in steps four and five in the main Audacity program window as well.
Right-click that device and select Enable. The Stereo Mix device should now be visible.In the Sound window, click the Recording tab, right-click in a blank space in that tab, and select Show Disabled Devices from the drop-down menu.Open the Control Panel on your computer and click Hardware and sound, then the Sound icon in the Control Panel window.
If Stereo Mix is not available, it is likely disabled. It's best to use an online service, as discussed above, to download audio from a YouTube video. Therefore, the steps in this section will not work for you. If your computer has an integrated sound card, you'll not be able to download streaming audio.
