Sound, video and game controllers
High definition Audio device = Digital sound output from MB.
NVIDIA virtual audio Device (Wave extensible) (WDM) = Digital sound output thru HDMI (sound enabled monitor or TV)
Realtek High Definition Audio = analog outputs and inputs on MB.
Multimedia Audio Controller, which has warning sign, I don't know what it is. Try it's properties and note "Hardware Ids", if you google that, it should tell you what it might be.