Audibly protested about eg John, Paul, or George (not Ringo) being amplified (7)

I believe the answer is:

boosted

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'being amplified' is the definition.
(thesaurus)

'audibly protested about eg john paul or george not ringo' is the wordplay.
I cannot really understand how this works, but
'john' could be 'st' (synonyms) and 'st' is present in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

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I've seen this clue in The Times.

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