A music schoolteacher who raped and sexually abused nine children in Australia had spy cameras installed in his house and used sex toys on his victims, a court was told on Tuesday.

Colin Harold Doo, 51, pleaded guilty at the Supreme Court here to 36 charges including 12 counts of committing indecent acts in the presence of a child under 16, nine of producing child pornography and seven of rape. He committed the crimes between 1996 and 2008.