Install asmix by entering the following commands in the terminal:
sudo apt update sudo apt install asmix
Description:
display a volume knob
The volume knob adjusts the master volume of your sound card. Just grab the knob with the left button of your mouse and drag it around.
Homepage: http://www.tigr.net/afterstep/view.php?applet=asmix/data
Version: 1.5-4.1build1
Section: universe/x11