Is your feature request related to a problem? Please describe.

If I mute my sound, I lost the indicator (in my ramp-volume) to show the volume level.

Why does polybar need this feature?

Here's a use case that describe why I think my feature will be a great addition to polybar.

1. I start a playlist of music and do other things on a different workspace
2. I got a call and mute my sound
3. I forgot that my music is still running and unmute my headphone and get blasted by the music

Describe the solution you'd like

A solution would be to have a ramp-muted that would let me use a different muted icon depending on
the volume level.

Describe alternatives you've considered

I could auto-pause my music when I mute my sound but what if it's a video on youtube or a meeting
on jitsi or any other platform. I would have to configure all of them to auto-mute (if it's possible).
Having an option in polybar would be much simpler.

Currently, as a workaround I use %percentage% but I'd really like to have an icon-only config.

Thanks for considering my feature request