Revolver (Beatles album) audio miking and automatic double tracking (ADT), in addition to employing musical instrumentation outside of their standard live set-up. Some of the changes in studio practice introduced by "Revolver", particularly ADT, were soon adopted throughout the recording industry. The sessions also produced a non-album single, "Paperback Writer" backed with "Rain", for which the Beatles filmed their first on-location promotional films. In the UK, "Revolver" fourteen tracks were released to radio stations throughout July 1966. In the US, it was the last Beatles album to be subjected to Capitol's policy of altering the band's intended running order and content. The release
Revolver (Beatles album) resulted from varying tape speed (or varispeeding) extended to recording a basic track at a faster tempo than they intended the song to sound on disc. During the sessions, Emerick recorded McCartney's bass guitar amplifier via a loudspeaker, which Townsend had reconfigured to serve as a microphone, in order to give the bass more prominence than on previous Beatles releases. Although this particular technique was used only on the two songs selected for the May 1966 single, an enhanced bass sound was a feature of much of the album. Emerick also ensured a greater presence for Starr's bass drum, by