Dante said:
what's weird is that even a free shareware program can alter tempo with minimal effects on pitch (if it all) so i have no explanation for ghetto gospel whatsoever. em is only partially to blame too, since various engineers and the final person who mastered the tracks all had toughed them in the process.
experts in the industry know what eminem did was a variation of voice imitation. sure, its not used much, but eminem thought it's use preferable in this case.
im guessing em didnt like the way pac sounded slowed down (to fit the beat) and so used this not-perfect-by-any-means technology to extract data from pac's voice and let himself rap on top to give the acapella a broadened sound, after adopting pac's characterisitics. even the experienced engineers standing by eminem could do nothing more than what we hear on the final product. im glad this technology is not as advanced as it might be, or we'd be hearing elvis advertising bathroom accessories amongst other stuff. im not even going to fathom what amaru might do...
still though, i dont understand why they used this in the first place. as you said, dante, they have the ability to slow the acapella down with no affection to pitch and other stuff, so why? there is no reason to suppose that they didn't have the studio acapella.
.... the mysteries of life