[AAR.oner]

you can research the key that the song was written/played in, and correct to that...&/or compare to other releases from the time...but it all comes down to the discerning ear

however, keep in mind that old cassettes typically have varying speed/pitch problems...so pitch correction isn't a "this tape needs to be slowed down by x%" sorta process...a 60 min tape can take a LOT of time since yer havin to go thru frame by frame, constantly adjusting the pitch accordingly


that said, i would personally use Ableton Live for the process, or Logic...numerous other programs/plugins out there tho