It's been my experience when a client voices their own ad, breaking it into short bursts interspersed with an announcer (in this campaign, one who's kind of a chowder head) tends to be more friendly to the ears of a casual listener. But occasionally it's good to let said client voice the whole thing. The caveat is making sure there's a fly in the ointment to keep the unpredictable campaign scenario going. In this sample I just had one voice part, which was minor. But, when you give the client palatable direction, they can pull it off and hopefully leave some members of the audience with a "sheepish" grin.