A strange indie flick directed by Kentucker Adley and Albert Birney, Sylvio centers on a gorilla who works at a debt collection agency where he makes phone calls using a computer that verbalizes his typing. Sylvio doesn't find the work fulfilling and hopes to take his talents to TV, where he wishes to put on puppet shows. The film makes its Cleveland debut tonight at 6:30 at the Cleveland Institute of Art Cinematheque, where it shows again tomorrow night at 9:45. Tickets are $10, $7 for members and students. (Niesel)