i use cubase to master my shit. like rbenea said your need a multiband compressor tryn get hold of a waves bundle. the C4 multiband comp is not too bad n will do the trick. you also should tryn use a multiband eq. again the waves bundle has the q4 which is aight. its important to practise mastering your own shit at least as best you kan. you kan get a pretty good sounding mix with spending a lot of money.