hercufles: I was wondering since its been a while that i played advanced dungeons and dragons and never used dual class. But i noticed (maybe its tutu) that coran is a lvl 6 fighter rogue doesnt that mean is a lvl 12 character? If you add those 2 together?
No, that'd be if it were with 3.x rules, in BG's 2.x it's different.
Basically you get a 6th level dual- or multiclass for the same XP you'd need to reach 7th level in a single class.
The XP needed to reach the next class is independent of how many levels you already have in some other class.
End result, dual- and multiclass characters are generally more powerful than singleclass characters in 2.x rules,
and less powerful in 3.x (NWN, Elemental Evil) rules.