Uneven will efficiently enforce a constant microphone volume level, to counter annoying volume "leveling" adjustments performed by e.g. BlueJeans.
Install the rpm, then read
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|Epel for CentOS 7||x86_64 (0)*||Epel for CentOS 7 (24 downloads)|
|Fedora 27||x86_64 (0)*||Fedora 27 (7 downloads)|
|Fedora 28||x86_64 (0)*||Fedora 28 (11 downloads)|
|Fedora 29||x86_64 (0)*||Fedora 29 (1 downloads)|
* Total number of packages downloaded in the last seven days.