Regarding the third party software on linux, I’m unsure. When im using my linux boot i just use the equalizer built into the dac itself and mimic what i figured out using third party on windows.
I imagine there’s third party that would interface with it since its just like any other audio software. Something like PulseAudio that sits on top of ALSA. That said id recommend doing your own research as always with your flavor of linux/setup.
Oh! My bad. EqualizerAPO / SourceForge is what i used briefly. I tried a few others but their names escape me.
Was nice being able to control everything more fluidly and import presets from various audiophile testing websites to figure out what sounded best to “me”.
Years of listening to Metal at ‘way too loud’ on the dial has made my ears uh ‘unique’. So i cant just drop in stuff and it sound immediately perfect. Gotta tweak it a smidge.