Disney's commercial success with “sound cartoons” inspired imitators and tinkerers to make their own early explorations of music-driven animation. Many of them had learned techniques at Disney, which may have minimized the variation in methods across competitors at the time. The editor's responsibility to maintain a standard for character believability also plays out when working on sequel franchises. In the case of the Toy Story films, the actors were voicing the same characters literally for decades. The objectives in casting for scratch dialogue are necessarily different than for the final production voice. Certainly, someone with the approximate vocal register of the character in question is desirable: apparent age, gender, tone, and volume are all taken into consideration. In animation, when editors are putting together the Story Reels, they are making all those sound effects choices; they're basically inventing that sonic reality.