Welcome!
Well, it's not as ultimate as it could be but also it's not so bad so far.
ULTIMATE SOUND VISUALIZER 2,000,000® uses JACK Audio Connection Kit as base sound system,
if you are using Ubuntu or another distribution with PulseAudio I have good news for you — You even don't need to
download this piece of script on your computer. I made it for myself as my first attempt into Go
programming language.
Code uses xthexder's go-jack library/bindings for JACK Audio Connection Kit.
./jack-peak-meter -title
go build jack-peak-meter.go