What your asking for isn't as cut and dry as you're probably thinking, in this type of scenario your EQ settings main purpose is simply for correcting less than ideal loudspeaker and listening environments.
While no one yet has been able to define what sounds good and what doesn't, recording engineers have developed various techniques for emphasizing what they consider to be the more pleasant qualities of musical sounds. In fact, most engineers pride themselves on getting their own sound. This is an area of personal taste, so naturally there are no hard fast rules to apply. Some good starting points can be established though, as followed.
Generally speaking, you would boost treble for clarity or presence (although midrange can sometimes affect this also), and bass for fullness or punch.
Sometimes it may seem that no matter how much top or bottom you add, something is still not right? Often the real culprit is one or more unpleasant resonances, especially if the range is out of basic adjustment or of low quality.
Eliminating those unpleasant midrange resonances will often improve the sound and minimize a need to boost highs and/or lows.
My suggestion is listening to the pre-set settings and finding one that sounds good to you with a few songs that are different musically, and then fine tuning your adjustments from there.
