- Laptop Dell Inspiron 1750
- antiX 9, 32 bits
- Default iceWM environment
I install flatpak:
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sudo apt-get install flatpak xdg-desktop-portal-gtk
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flatpak install flathub org.kde.kdenlive
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sudo apt-get install pulseaudio pavucontrol
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pulseaudio --start
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dbus-launch flatpak run org.kde.kdenlive

At this time the version of kdenlive are 19.08.2:

To manage the entire volumen you need to put in the terminal:
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pavucontrol
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pulseaudio --kill