Again, and in principle, you ought to be able to digitize waht you have, warts and all, so to speak. You'd want to use a prodigious bit rate and listen to a digitized sample. You'd need a circuit that stayed linear in the same way that your favorite listening environment does, so that nothing reaches the recording as an electronic signal that would not normally reach your ear as an acoustic one - and, of course, that you could hear. The task is exacting and nuanced, but, if signal processing is about where I suspect ti ought to be, then feasible.