The audio special effects included the use of spring and plate reverb units, as well as an Echoplex - an endless loop tape recorder with a fixed record head and a playback head that slides on a rail. This arrangement of record and playback heads creates an echo that can be time-adjusted. By turning up the record volume you can create an echo that repeats endlessly. Typically this would only be used for limited lengths of time because the hiss from the magnetic tape would build up to the point of creating a whirling wind-like sound. In order to create the density of bird sounds without amplifying the wind effect, they used a separate recorder and many takes from the Echoplex, layering the result while adding other types of bird sounds to produce the final result. There are a few moments at the end of an attack that the bird sounds drop in pitch and speed. This is created by sliding the playback head away from the record head. In some rock recordings in the 1970s this was used for UFO sounds.

Film

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