Mason's early drum sessions were performed in an open space on the top floor of Britannia Row Studios. The 16-track recordings from these sessions were mixed down and copied onto a 24-track master, as guide tracks for the rest of the band to play to. This gave the engineers greater flexibility, but also improved the audio quality of the mix, as the original 16-track drum recordings were synced to the 24-track master and the duplicated guide tracks removed. Ezrin later related the band's alarm at this method of working – they apparently viewed the erasure of material from the 24-track master as "witchcraft".