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I have a program which plays sound. That program doens't have "disable sound" option. How can I manage sound of programs from ubuntu (or Linux) itself?

I don't want to decrease whole device sound 'cause I want to play music.

I use xubuntu (if helps).

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    pavucontrol (pulse audio volume control) lets you proportion most applications sound, or individually mute specific ones. It's not perfect, but is my default go-to for that sort of thing (some programs rely on the OS playing event sounds - so they aren't individually controllable as play as part of system-sounds...Depending on your version of Xubuntu - there is a great pavucontrol plugin for your panel from 18.04 up (which gets better! as you move to later versions as they add more features). – guiverc Dec 18 '18 at 8:43
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I would suggest using pavucontrol (Pulse Audio Volume Control) which lets you individually set volumes of programs, or mute them. It's not perfect, as some programs use system-sound calls to play audio effects (eg. I nearly always have hexchat running, but I can't control it's volume except via system-sounds volume which is fine too).

pavucontrol window shot my Xubuntu 18.04 LTS

My screenshot is of pavucontrol on my Xubuntu 18.04 LTS box, with audacious playing music (hence blue bar showing volume), ambient-noise playing sounds (currently louder than audacious) & vlc (paused so silent). You'll note a volume-X button to the right of each, which lets you MUTE those sound tracks. To adjust the volume of hexchat I'd adjust the slider for system-sounds.

If using 18.04 LTS or later, I'd also suggest adding the PulseAudio Panel Plugin to your panel, as it allows pausing/playing/next/previous for your running audio programs, plus quick access to the Audio-Mixer (or the pavucontrol I've provided a picture of). The panel plugin has even better features if you're running 18.10 or later.

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