Note that widget uses the Arc icon theme, so it should be [installed](https://github.com/horst3180/arc-icon-theme#installation) first under **/usr/share/icons/Arc/** folder.
- _Optional step._ In Arc icon theme the muted audio level icon (![Volume-widget](./audio-volume-muted-symbolic.png)) looks like 0 level icon, which could be a bit misleading.
So I decided to use original muted icon for low audio level, and the same icon, but colored in red for muted audio level. Fortunately icons are in svg format, so you can easily recolor them with `sed`, so it would look like this (![Volume Widget](./audio-volume-muted-symbolic_red.png)):
If you want to control volume level by keyboard shortcuts add following lines in shortcut section of the **rc.lua** (the commands could be slightly different depending on your PC configuration):