I am writing my first giallo novella. The Modulator started as an idea from watching a documentary, on FBI surveillance in the 1970s, called Fear City. I became intrigued by the idea of fairly, close range recording devices and went down a rabbit hole exploring the old tech. I found the archaic specifications of covert listening devices using dirty pulse audio masking schemes at the Crypto Museum. Armed with this tech, the inciting incident became a long ago murder with all t