SWELL is a smartphone app that changes your mood through sound. When a young couple try to control each other's settings, they find their relationship threatened by an unintended cacophony o... Read allSWELL is a smartphone app that changes your mood through sound. When a young couple try to control each other's settings, they find their relationship threatened by an unintended cacophony of emotions.SWELL is a smartphone app that changes your mood through sound. When a young couple try to control each other's settings, they find their relationship threatened by an unintended cacophony of emotions.