Opera house electronic libretto systems have begun to be used in some opera houses, including New York's Metropolitan Opera, Milan's La Scala, and the Crosby Theatre of The Santa Fe Opera, which provide two lines of text on individual screens attached to the backs of the seats so as to not interfere with the visual aspects of the performance. A subtle type of sound reinforcement called acoustic enhancement is used in some opera houses. Acoustic enhancement systems help give a more even sound in the hall and prevent "dead spots" in the audience seating area by "...augment[ing] a hall's intrinsic acoustic characteristics."
Attila (opera) Ramey "unquestionably rack[ed] up more performances in the role than any bass since its creator" in houses such as La Fenice and San Francisco, finally making an audio recording in 1989 and a video recording in 1991, both under Riccardo Muti. Ramey again appeared in the title role in a production staged by La Scala in 1986 and filmed for DVD release. In February 2000 a concert performance was given by the Opera Orchestra of New York, again featuring Ramey as Attila. The Royal Opera House premiered it on 13 October 1990, with Ruggero Raimondi in the title role, Josephine