Crossword Genius

Increase in volume (7)

Ross

I think it could be either:

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7

9

amplify

(Other definitions for amplify that I've seen before include "Make fuller, increase the strength of" , "Increase (a signal)" , "Expand" , "Add strength or details to" , "Make (signal) bigger" .)

I've seen this clue in the Sydney Morning Herald.
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