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How to control your Pulseaudio sound volume using the ...
https://securitronlinux.com/debian-testing/how-to-control-your-pulseaudio-sound-volume-using-the-command-line/
Pulseaudio can easily be controlled with the command line. The pactl utility is used to control the sound volume of a Pulseaudio sink. List all sinks with this command. jason@jason-desktop:~$ pactl list sinks Then look through the list to see which is the device you wish to control, then use this command to increase the sound volume.
How to Use PulseAudio to Manage Sounds on Ubuntu 18.04
https://linuxhint.com/pulse_audio_sounds_ubuntu/
PulseAudio lets you control the left and right speakers separately. Just click on the lock toggle icon in the Output Devices tab and you should see two separate sliders as marked in the screenshot below. You can drag them left and right as till you get the result you want. You can control sound input devices from the Input Devices tab.
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