Pitches what they've written? (5)

I believe the answer is:

notes

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'pitches' is the definition.
The answer and definition can be both human attributes as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for notes that I've seen before include "registers?" , "Short written messages" , "Short missives" , "Sounds" , "Written comments" .)

I've seen this clue in The Irish Times.

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