 This included the band's first use of a horn section, on "Got to Get You into My Life", and the first time they incorporated sound effects extensively, during a party-style overdubbing session for "Yellow Submarine".Author Mark Brend writes that, with "Revolver", the Beatles advanced Meek's strategy of employing the recording studio as a musical instrument and "formalized this approach into what is now an accepted option for pop music making".A key production technique they used was automatic double tracking (ADT), which EMI technical engineer Ken Townsend invented on 6 April.