Iphone Music Help?

Has anyone ever had this, where your listening to one song and its fine, another genre of song plays and its either too low or too high…
How can you manually set your EQ on the iphone with a graphical EQ rather than the standard presets they give you?
I listen to all types of music and its annoying to change everytime the tune changes, especially in the gym?!
Answer #1
hmm try the volume ..
Answer #2
turn on sound check. i think you have to do it in itunes first and then you can turn in on, on your phone.
if you dont know how to do that.
in itunes you click on edit, then click on preferences, then under the Playback, finally check the sound check box.
On Iphone go into settings, click on ipod, turn sound check on.