function to place markup in the same staff-position of the notehead?

[josé henrique padovani]

Hi,

I want to write a function to place markups (like \postscript blocks) 
just after (but in the same Y-offset) my noteheads...

I know I have to use something like that to allow the TextScript to be 
inside the Staff, etc...
\once \override TextScript #'outside-staff-priority = ##f
\once \override TextScript #'side-axis = #0
\once \override TextScript #'direction = #CENTER
\once \override TextScript #'X-offset = #2

But how do I get the staff-position of a note and use it to adjust the 
Y-offset of my markups? (is it the ly:grob-staff-position function?)
And how do I set a function to do that?

Any help is appreciated...

josé

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