i recorded this groups album over the past 5 months and we did double takes plus ad libs on eeeeevery rhyme on every song. double takes and voice overs helped their sound greatly. without it, their vocals had no presence, soul or "life" it seemed like, so i had them do the double takes for their own sake. this wasn't a project i was personally behind, i was gettin paid like Ash in his situation. my job was basically to get the best possible sound, and in their case (not to shit on their talents) they needed the double takes.
my technique was pretty simple though.. i had one main take that had good processing on it and the doubled take would be mixed very low. it wasn't a full spectrum 2pac stack at all, one would just be mixed low and it'd fill it out nicely. Gave it an "artificial naturalness" to it..
aha.. yeah i had to make up a term to describe it, but the technique has its place like you guys already said.