Sound from Abbado, perhaps lacking volume at the start (5)

I believe the answer is:

audio

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'sound' is the definition.
(audio means sound)

I don't understand how the remainder of the clue works.

(Other definitions for audio that I've seen before include "Car" , "Sound, as opposed to vision" , "Relating to sound or hearing" , "Reproduction of recorded sound" , "Prefix relating to sound" .)

I've seen this clue in The Independent.

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