Makes dull sound with new-fangled touchpad, eschewing capo (4)

I believe the answer is:

thud

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'capo' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

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

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(Other definitions for thud that I've seen before include "Dull bang" , "Sound made by impact of heavy objects" , "Dull, heavy sound" , "Dull heavy noise" , "Clonk" .)

I've seen this clue in The Irish Times.

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