Inserting Numbers into Noteheads

[Bjorn]

Hi LilyPond support,

I need to insert numbers into the noteheads 
of sheet music and went to your help page: 
http://kainhofer.com/~lilypond/Documentation/notation/note-heads.html

It showed me how to insert the numbers for scales (1-7), 
but I was looking to insert them 1-12, from 
middle c up to Space 5 G for educational music 
I use at elementary schools.  Please help me to bypass the 
7 number limit and use a scale of 12.  Thank
 you for your help on this matter.

Sincerely,
Bjorn