Quality of sound varies on a screen (9)

I believe the answer is:

resonance

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

'quality of sound' is the definition.
'resonance' can be an answer for 'sound' (thesaurus). I am not sure about the 'quality of' bit.

'varies on a screen' is the wordplay.
'varies' indicates an anagram (I've seen 'vary' mean this).
'on'+'a'+'screen'='onascreen'
'onascreen' is an anagram of 'RESONANCE'.

Can you help me to learn more?

(Other definitions for resonance that I've seen before include "Plangency" , "continuation of noise" , "Sonority" , "Sound amplification" , "shaking" .)

I've seen this clue in The Irish Independent.

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