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This solution comes from the web site [https://askubuntu.com/questions/749407/is-there-any-way-to-prevent-application-from-changing-volume-level-of-my-microph AskUbuntu - Is there any way to prevent application from changing volume level of my microphone?]This solution comes from the web site [https://askubuntu.com/questions/749407/is-there-any-way-to-prevent-application-from-changing-volume-level-of-my-microph AskUbuntu - Is there any way to prevent application from changing volume level of my microphone?] or see also [https://askubuntu.com/questions/279407/how-to-disable-microphone-from-auto-adjusting-its-input-volume this post].