If you're using Linux, there are many good and free audio processing applications available.
Might take a few minutes to compile and learn, but for an all-in-one yet not too complex solution to processing audio, I would recommend rezound.
It takes LADSPA plugins, so you will have access to many types of equalizers to get as detailed with your EQing as you could want.
You'll be working in a very nice GUI instead of struggling in a tiny Winamp window and only have to use one program.