Help with language

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Technically, the official language is Italian, since it is an Italian film, but most (if not all) of the actors were speaking English on the set, including Tony Musante and Suzy Kendall, who are American and English, respectively. Many Italian horror films were filmed in English because they wanted to make sure the American market would want to buy the film. Both English and Italian tracks are dubbed, with all dialogue and sound effects added later, because European filmmakers usually do not record the sound live on the set. For this reason I often choose the English track when I watch Italian horror films, especially if the film features American or English stars who dubbed their own voices.