Lyra made a cassette tape available in 1985, but I don’t think they have any more of them. It will probably be performed at the next Harp Festival of Philadelphia, October 8-11, 2010. I’m sure that is the correct tempo, what is printed. I would advise going over it with a Salzedo-trained harpist so you understand what he is after. You may be looking at the pages that are all pedal slides.
It’s a great piece, well worth learning. His tempi can be very fast, as he could play anything any way he wanted. Sorry I can’t just come over there and do a workshop or something. Maybe Floraleda Sacchi can help you. Judith Liber certainly could. You can learn the notes, but the sounds he wants are certain tone colors. If you have the Modern Study of the Harp, that will guide you in his notation and colors.