when you’re running media files using any media player application on Linux, it should show up in the Playback tab. You can control sounds for individual applications from the Playback tab of PulseAudio Volume Control. Analog Stereo Duplex is the default sound profile. As can see from the screenshot below, there are many sound profiles available by default. You can change sound profiles from the Configuration tab of PulseAudio Volume Control app. You can also click on the marked toggle icon to Enable or Disable sound recording. If you have many types of sound input devices installed, this should be a good feature for you. You can control what input devices you want to see in the Input Devices tab using the Show drop down menu as you can see in the screenshot below. Just click on the lock icon and two sliders should appear as marked in the screenshot below. Just like for the output devices, you can configure the left and right channel separately for the input devices as well. You can configure sound inputs for Microphone, Line In, Analog Input and Video. You can select more devices from the Port dropdown menu as you can see from the screenshot below. You can drag the slider to the left to decrease the recording volume, and drag the slider to the right increase the recording volume for your default recording device, which is in my case the Microphone. You can control sound input devices from the Input Devices tab. You can drag them left and right as till you get the result you want.
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. PulseAudio lets you control the left and right speakers separately. You can Mute and Un-Mute the sound by clicking the marked toggle button in the Output Devices tab. You can drag the marked slider to the left to decrease the output sound, and drag it to the right to increase the output sound.
You can configure the sound output from the Output Devices tab. This is the PulseAudio Volume Control graphical utility. Now you can open PulseAudio Volume Control from the Application Menu of your Ubuntu 18.04 LTS. PulseAudio Volume Control should be installed.
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