easyeffects : Limiter, auto volume and many other plugins for PipeWire applications ( https://github.com/wwmm/easyeffects )
volctl : Per-application volume control and OSD for Linux desktops. ( https://buzz.github.io/volctl/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a ambasta
For Paludis use this rsync : rsync://gentoo.zugaina.org/ambasta-portage
If you have a problem : ycarus(-at-)zugaina.org