Recorded in Estudios Filmocentro between september 1985 and februar 1986.
Song A4 is dedicated to the memory of Sebastián Acevedo Becerra, a worker, who has commited public self inmolation (with fire, as a protest act), as he experienced his sons desapeared in the hands on the secret police of Pinochet, 11 november of 1983 in Concepción, on the main square of the city.