U can do the regular timestreatch with in fruity/ Sx, etc.. but it ain't that perfect if u want prestine audio quality and little muchkisation.
I mean this would involve doing a series of timestreatchings/ pitchsifting for the same file in order 2 have the results u need.. still won't b perfect.

Like said b4 the best way 2 b able 2 seperate pitch from lenght is really the Roland Variphrase technology...

Z