Quoted from NPO:My experience in this is limited, but I do remember attempting what you are referring to. It definitely takes some time to do right - adding the callouts back in - and they will NOT match the audio quality of the OST. The OST will be booming, and then Raul Julia's voice will seem like a whisper in comparison.
Now, that being said, @Hazzard did BSD right, and best of my knowledge, the callouts for BSD match the energy of the accompanied OST. I am limited to YT videos, and I do know there are some pinsiders with PinSound in BSD already, and they could provide a greater testimony than I.
Looking at this video right here:Pinsider @colsond3 could vouch on this one.
The volume difference is fixable (painful, but possible), although the actual crap quality of the audio will be noticeable. You can get a pretty modern mix out of the game
