They 'dubbed in' the music. = They 'dubbed' the music 'in'.
He was hired to 'dub' the dialogue for a foreign film.
Critics 'dubbed' him the new king of rock ‘n’ roll.
(..) Very well. What is your name? Uh, oh, uh, Cricket's the name. Jiminy Cricket. - Kneel, Mr Cricket. - Huh? No tricks now. l dub you Pinocchio's conscience, lord high keeper ofthe knowledge of right and wrong, counsellor in moments oftemptation... and guide along the straight and narrow path. (..)1940 Pinocchio