text in staff and markup text font=addlyric font

[Jay Hamilton]

version 2.12.2
Subject: text in staff

I want to place test inside the staff lines
from the manual it looks like I should use some form of
\once \override TextScript #'script-priority = # %(some number here)


but it's not giving me a result that I can understand/use.

Should I try using some sort of 'padding' verbage or what?

And I need to have markup {"Text"} be the same size as 

\addlyric.  But I don't understand how to figure out what the lyric size is

I do have 

#(set-global-staff-size 25)

Where do I look to figure this out

Thanks
Jay

-- 
Jay Hamilton Sound and Silence www.soundand.com 206-328-7694