Ubuntu 18.04 turn off microphone volume auto adjust on Zoom
Solution 1:
The simplest way is to uncheck the "Automatically adjust volume" option in the audio settings from your zoom account.
Solution 2:
Sign in is required for the audio settings to be available.
Solution 3:
For zoom, you have to disable in
Audio settings (You can get to it from the arrow next to the microphone mute/unmute button) > Test speaker and microphone.
Uncheck Automatically adjust volume.
You can also install pavucontrol; but zoom overides it:
sudo apt-get install pavucontrol
... run with
pavucontrol
Hope this helps ...