Its arrangement developed as the band experimented in the studio. Bassist Ken Forssi had received a bass fuzz effect unit from an endorsement deal the band had signed with Vox, and Lee suggested Forssi use it on "7 and 7 Is".
The band's musical development during recording sessions led to an arrangement change for "7 and 7 Is". Ken Forssi, who received a bass fuzz effect from Vox, played a key role in this evolution.