Yeah, so many voices are just fantastic in BG III, and Balthazar is certainly one of them. Voice recording is a difficult thing. Assuming you start with a skilled voice actor in the first place, the next piece of equipment is the microphone. The old standard Shure SM58 is OK for live performances, but in the studio I can really hear the difference when you upgrade to something like a Rhode, Sennheiser or similar in the $1,000 price range (!) along with a good preamplifier. After that, compression and EQ are essential. A tight delay with wide spread between right and left channels can give a very pleasing and commanding effect, and a little reverb adds ambience appropriate for the setting (room, cave, outdoors, astral plane, etc.) It is definitely an art to find the sweet spot with all these components in the sound processing chain.
