In LFO, an amateur scientist develops a technique for hypnotizing people using a specific sound frequency. He puts this into action using his neighbors as subjects, and things get weird, as you’d expect. Fittingly for a trailer for a film about manipulation via sound, there is no dialogue here — this LFO trailer is all machine-made sound and atmosphere. There’s not much indication of the film’s sense of humor here, as this trailer is all about the weird. But that’s a good place to start.