It's not exactly main stream but there are groups like Graphic Audio doing great work that will probably lead down this road. They do a full cast audiobook wit

It's not exactly main stream but there are groups like Graphic Audio doing great work that will probably lead down this road. They do a full cast audiobook with sound effects, music, etc. and they tend to be altered slightly to work in the medeium - would not be surprised if the differences continue to grow.