jford:

The Audacity Edit > Preferences > Audio I/O window shows Playback Device and Recording Device. Both have dropdowns. Neither shows "stereo mix" nor "what-u-hear". Perhaps those show up if you have a Soundblaster card but not for the Realtek soundchip???

Does that seem correct?
Otherwise please let me know how to get to the Audacity settings you mentioned.
Thanks for your help!
LLOYD S