Count the number of notes

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I need to count the number of notes between to functions. For Example:

\new Staff{

     c4-- \startCount d8-> e8-> f8-> g8-> \stopCount

     #(display how-much-notes-selected)

}

This will be develop for more complex function that will change 
proportionally scale of every notehead in that kind of block, do the 
same as cresc. hairpins  but will act on every notehead instead of using 
spanner.


Cheers,

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