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Volume control with Sound BlasterX Katana

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I'm using the Katana soundbar, and have an issue with volume control in KDE. When I use volume up or volume down hotkeys, it shows new level on the soundbar, but only software "system" volume changes. This limits maximum volume a lot. Same thing happens when using the remote, or soundbar volume control buttons.

What's curious it's that alsamixer can control the volume correctly, but running it is way less convenient than just using keyboard shortcuts.

Is it possible to point system volume control to correct channel? I didn't find any options for that. Maybe there's a way to bypass KDE volume control and just bind alsamixer commands to keyboard shortcuts?

I'm using Kubuntu 18.04.

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