sound volume control for use in fluxbox?

Hello *,

For years I used Lumina desktop environment (which uses fluxbox as its 
window manager). Now the distro I'm using (Gentoo) is about to remove Qt5, 
and hence Lumina (it has not been ported to Qt6). So, I had to decide what 
to use as my desktop.

I decided to use bare fluxbox. It provides > 90% of what I need for my 
everyday work. But I need some extra things, and I ask for your advice 
what X programs to install.

First of all, I need sound volume control (or a mixer, but a simple volume 
control would be sufficient). Ideally, this program should sit in the 
toolbar at the bottom of the screen; when I click it, it should show a 
slider to set the volume by my mouse.

Second, I need a small gui program to display my battery status. Well, I 
can say
acpi
at the command line, but it would be nice to have something sitting in the 
toolbar and showing the battery status all the time.

These two things existed ti Lumina in its panel. Now, in the bare fluxbox, 
I need some separate X programs for these purposes. What programs do you 
use?

The only Lumina utility I sometimes used is for taking screenshots. What X 
program would you recommend for this purpose?

Many thanks in advance,
Andrey