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How to remove Audio Device (High Sierra)
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Try to remember if you installed something that could have added it and if you uninstalling the application properly should get rid of this.
If not try looking in /System/Library/Extensions/, /Library/Extensions/, /System/Library/PreferencePanes and /Library/PreferencePanes to see if you can find files related to it.
If not try looking in /System/Library/Extensions/, /Library/Extensions/, /System/Library/PreferencePanes and /Library/PreferencePanes to see if you can find files related to it.
Take a look in Audio Midi Setup. Something may be in there. Alternatively, is the erroneous device broadcasting rather than listed? It might be an airdrop device. Just a thought...?
what randomgeeza said. try turning off wifi, bluetooth. still there? def then a visit to the audio midi setup (in your utilities folder); check the audio devices there.
"UI sounds" (ie 'user interface sounds') suggests this is for an app; something you must have installed. can you delete those listings from that audio midi setup window?
EDIT: what brian suggests, above. try the free 'easyfind' app (on the app store), and you can search your entire drive (be cautious with what you remove)...
As you can see in the picture i cannot press "-" only "+", and on search is nothing for "mmaudio"
The driver should be in the "/Library/Audio/Plug-Ins/HAL" folder (It's the standard place for Core audio drivers)
bist Thank you so much, i delete the MMAudio folder from Library/Audio/Plug-Ins/HAL and the audio device now is removed. Also you have to restart the Mac 
Problem solved, thank you! 
Problem solved, thank you!
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I searched with Command + Spacebar and nothing...how exactly i have to search to find? Other things i found but that folder no...
You deleted it?
I usually include an additional condition, File Visibility: Visible or Invisible, just in case.
I usually include an additional condition, File Visibility: Visible or Invisible, just in case.
probably just the file in the plugins folder; i work with audio, and have encountered that very thing before (i always do an easyfind search as well).
bist Thank you so much, i delete the MMAudio folder from Library/Audio/Plug-Ins/HAL and the audio device now is removed. Also you have to restart the Mac
I just had this exact same issue, and this worked for me too
This sounds like the answer to my issue, as well. Where do I find "/library/audio/plug-ins/HAL" ? I can't find it on my early 2015 Macbook Air with Mojave 10.14.5.
Thanks!
Library folder is at the root of your hard drive, along with Applications, System, and Users.
So, Open the Library folder, then the Audio folder, then Plug-ins. There should be a HAL folder. Open that folder.
If you find a MMAudio Device, or MMAudio Device.driver folder - you can delete that folder. You may have to provide your admin password to remove it, but that should do it. Restart after deleting that folder.