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I use the app Workrave to help keep RSI at bay. However, the app has a higher sound volume than I'd like, while the rest of my system is just right for me. Is there a way I can lower its volume while keeping my system's volume as it is?
You can install pavucontrol :
$ sudo apt install pavucontrol
In the Playback tab you can choose the volume output for each audio stream.
Required, but never shown