Curse those fools at Coldridge for letting Corvo get away. Who knows what the man could do now. Hiram, or the Lord Regent, as he asks us to call him now, seems to have faith in all the Sokolov security devices he’s put up all over the city. But I’m not so sure. At least the girl has been moved to a safe place. Visiting her twice a week has given me ample opportunity to 'inspect the facilities' as they say. So there’s an upside, at least.
The audiograph can be found on a table in Campbell's secret room during the mission High Overseer Campbell.