On an unrelated note, as far as I can recall someone made a system-wide equalizer that can be used in conjunction with the media player (including OMP).

However, that project seems to be old and not up-to-date when I last attempted using it, and so far it never worked for me. Some people say that it stopped working after PR1.3 (the equalizer was done before PR1.3 came out IINM), anyone can get it to work again somehow?

I think this is one of the threads discussing the problem.