I would like an equalizer for the system sound on Windows 10.
The problem I am trying to solve is, I am working regularly with some coworkers who work in another office, so we meet over VoiP. For whatever reason, some of these meetings have a very high-pitched noise, like my ears are ringing. I'd like to remove this noise. I have experience producing computer music, so I know enough to take an equalizer and cut the frequencies that the noise is on.
I'd prefer a free-as-in-beer solution, but as long as the software is reputable, I'm not picky about free-as-in-freedom or open-source software.
My request is a near-duplicate of Equalizer (EQ) for all sound in Windows?, but that question is about Windows 7, not Windows 10.