Here are the major equalization techniques.
http://home.earthlink.net/~tgcook/equalize.html
Frenzel is probably one of the most popular of those. Learn how to do it here. Some people learn it in a few minutes for others it takes many days and lots of practice.
http://prince.ton.tut.fi/~jome/vocal_frenzel.html
If you do a search you can find a lot of information on equalization.
