Imagen del sonido: Ingeniero Joselito Rodríguez

Interesting account of the invention of the sound system developed by Mexican filmmaker Joselito Rodríguez, successfully tried and tested with the first sound film made in México, "Santa" (1931). Rodríguez worked as sound engineer in other classics, as "Redes", and he went on to direct singing superstars Jorge Negrete and Pedro Infante, respectively in popular musical dramas "¡Ay Jalisco... no te rajes!" and "Angelitos negros"; as well as the 'lucha film' (wrestlers films) "Huracán Ramírez", starring David Silva. The documentary, made for the 70th anniversary of the release of "Santa", includes heartfelt and moving testimonies by colleagues and friends, including actresses Lupita Tovar and Carmen Montejo, director Miguel Zacarías, film editor Carlos Savage, producer Gregorio Walerstein, composer Sergio Guerrero, and his own sister Emma.