NBC NEWS has an article on Carlos José Alvarez who wrote and arranged the music for Exposed. He detailed the whole process involved in writing the music for the film and following it through to the final mix used in the film. With regard to Exposed, he said the following:
He says he had this idea of using a female voice, so he sought out the Cuban-American award-winning Broadway star from “In the Heights” – Janet Dacal – for her very strong vocals, and gave her a scene.
“It was the most exciting part, because I knew I had found the heart of the score through her voice,” says the composer. “We really explored the mysterious, almost haunting, side of her voice. It really pulled us into Isabel’s reality and perspective…When I played it for everyone, we all thought this is it.”
Through the orchestral score, which was made up of 34 string players and piano, Alvarez says the main challenge was to connect the two worlds of Isabel and Keanu Reeve’s character, and express to the audience what the characters are feeling and experiencing
It was a good read.