In MacOS Mojave, I want to get the Mic volume icon to the menubar, just like the speaker volume icon. How can I do that?
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This app works for me: MuteMyMic. Available in the App Store at that link.
Appears to be free, as well.
It puts an icon in the menubar with a mic input level slider:
Disclaimer: no financial or other ties to the developer of this amazing app which I just found using Google.