Changes in volume, namely before coda in revised score (10)

I believe the answer is:

crescendos

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'changes in volume' is the definition.
(a crescendo is a gradual change in volume)

'coda in revised score' is the wordplay.
'coda' becomes 'scend' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'revised' is an anagram indicator.
'score' with letters rearranged gives 'creos'.
'scend' put inside 'creos' is 'CRESCENDOS'.

'namely before' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Guardian.

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