from Hacker News

Years ago I would always use KM Player on PC for its advanced filters so I can listen to specific parts/sounds on a particular song. For example there were features like, vocal focus, vocal remove, left-only, right-only, etc. Now KM is all bloated with ads and no longer includes these features.

Does anyone know of any PC software or Android apps that can do something similar?

I can find plenty of apps that can control basic EQ or have presets like bass boost, or "rock"/"pop" EQs etc, but nothing advanced like the ones I mentioned for old-KM.