Nobody has advanced the application of technology in music more than Peter Gabriel. His pioneering use of the Fairlight CMI helped popularise that instrument and give credence to sampling as a creative recording practice. Yet his music has never fallen prey to the technology trap - his latest album So remains a soulful collection of songs heavily reliant on technology but applied with subtlety. Ray Hammond talks to the great man about the album, new technology, Otis Redding, and his role as musician.