“LFO: The Movie” (2013): Dark Science Fiction Dramedy from Sweden

A cuckolded husband, a sound engineer by avocation, discovers a combination of sound frequencies (involving LFO, or Low Frequency Oscillation) that enables him to control others. He uses this knowledge first for his own benefit, then decides to put it to more altruistic purposes — at least, as he sees them. Or does he? The man, Robert (Patrik Karlson) suffers from a paranoid psychosis for which he takes medication. We learn this when we realize (very early in the film) that his cheating wife Clara (Ahnna Rasch) is actually dead; he is hallucinating her presence. Can we believe his discovery is real?