James Guthrie, recommended by previous Floyd collaborator Alan Parsons, arrived early in the production process. He replaced engineer Brian Humphries, who was emotionally drained by his five years with the band. Guthrie was hired as a co-producer, but was initially unaware of Ezrin's role: "I saw myself as a hot young "producer" ... When we arrived, I think we both felt we'd been booked to do the same job." The early sessions at Britannia Row were emotionally charged, as Ezrin, Guthrie and Waters each had strong ideas about the direction the album would take. Relations within the band were at a low ebb, and Ezrin became an intermediary between Waters and the rest of the band.