Crossword Genius

Didn't accept it should be muted (6,4)

Ross

I believe the answer is:

turned down

I'm a little stuck... Click here to teach me more about this clue!

'muted' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?

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

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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