This ambitious documentary turns up the volume on long-silent voices lurking beneath the surface of the Latin hip-hop underground, revealing the origins of a genre that still has to fight to be heard. Highlights include a behind-the-scenes look at the artists' creative process, plus candid interviews with stars who share stories about making it in the business -- from Mellow Man Ace and Capone to Delinquent Habits and Psycho Realm.