Recently I got an issue on Telegram that I suddenly could not speak to my voice call students on my computer with my favorite Plasma Desktop. This issue blocked all my teaching sessions since mid May and I was forced to use another (fortunately I have) operating systems with Telegram in my computer without Plasma which is less convenient for me for this job. Fortunately now after doing a workaround in volume control, it is solved, and finally I can do my job again. If you encountered similar issue with other software like Sound Recorder or Audio Editor, you can use this report too to solve it. Here is my report.

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Imagine your laptop's left speaker is broken so every time you play something you hear noisy sound although the right speaker is normal. Then, you want to disable or reduce left speaker's volume while retaining the right one. On KDE system like Kubuntu, I find no such configuration on either its System Settings or Sound Volume tray. In fact, my left speaker is actually broken now so I need control for both of them on Neon GNU/Linux. Fortunately, I managed to do so installing PulseAudio Volume Control. The procedures are simple:

1) Install the tool:

$ sudo apt-get install pavucontrol

2) Run PulseAudio Volume Control.

3) See Output Devices tab.

4) Click shield button on top-right corner, so you see two sliders: Front Left and Front Right.

5) For example, I reduce the Front Left slider to 14% but let the Front Right 100%. This way, I can hear normal playback sound once again by using only the Right Speaker.

6) Try to play audio.

Happy working!
 

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This article is licensed under CC BY-SA 3.0.