What ya what is steinbergs Freefilter... it will analise yer reference track in 32 dif. freq. do an average of the level of each... then u'll play yer track analise again, then use the morph slider, presto!! b very carefull cause u need 2 have a track with very similar components 4 this 2 work correctly! ;)
There are other plug ins but I can't remeber the name really... I think there was one called Voxego EQ aswell.
Z