After work at Elsinore finished in July, the sessions moved to Windmill Lane Studios where Eno, Flood, Lanois, and previous U2 producer Steve Lillywhite mixed the tracks. Each producer created his own mixes of the songs, and the band either picked the version they preferred or requested that certain aspects of each be combined. Additional recording and mixing continued at a frenetic pace until the 21 September deadline, including last-minute changes to "The Fly", "One", and "Mysterious Ways". The Edge estimated that half of the sessions' work was done in the last three weeks to finalise songs. The final night was spent devising a running order for the record. The following day, the Edge travelled to Los Angeles with the album's tapes for mastering.