 In the early Seventies Jermyn helped to design a new musical instrument, the Electronic Sackbut, with Dr Hugh LeCaine from the National Research Council.He spent several years doing lecture tours demonstrating the instrument and did the theme tune for NBC TV's children's science programme, “Dr Wizard” using the Sackbut.During the Eighties and Nineties he did freelance TV work and wrote soundtracks for films, including the special effects for “Heavy Metal”.