If anyone knows how/what/huh? these recordings came to be, please fill me in. I can hear ... I think the term is bleed through from the other instruments, quite faint in the background. So these are not the master tapes, correct? The masters would have each voice and instrument in isolation, most of the time. Stop me if I'm wrong.
So are people using some kind of software on the finished recordings to isolate certain instruments? I don't even know if that's possible after something has been mixed down.