Earlier Radio Theater plays, issued at the early 1920's, were theater scripts played on a conventional stage in which superimposed the voice of a narrator explaining on radio all that was not appreciated only with the ears .
To simulate the sound effect ticking of a clock, we can achieve if we roll a pencil between our hands with a ring on one finger.
In 1961, Spanish Radio and TV Gemeral Management Office thought that seven Lorca's scripts were 'not allowed for broadcasting' because its content and were forbiden until 1977. Some of those scripts were rhe three gold Lorca pieces: 'Yerma', 'Bodas de sangre' and 'La casa de Bernarda Alba'.
To simulate the sound effect of a shower can be achieved by slowly pouring a bag of rice in a plastic container.