Can anybody help me with fret diagrams?

[Father Gordon Gilbert]

I tried out my first fret diagrams just recently and I ran into a puzzling situation.

Whereas in standard guitar tuning, the A major chord diagram would look like this:
aFretDiagram = \markup 
    \fret-diagram #"6-o;5-o;4-2;3-2;2-2;1-o:"

And the standard A7 diagram would look like this:
asevenFretDiagram = \markup 
    \fret-diagram #"6-o;5-o;4-2;3-o;2-2;1-o:"

(I'm not worrying about fingering for now.)

I have a custom way I like to play the A7 chord which imho provides a brighter 7th sound.  It should look like this (using the same coding):
asevenspecialFretDiagram = \markup 
    \fret-diagram #"6-o;5-o;4-2;3-2;2-2;1-3:"
That is, the standard A chord with the G (seventh) played on the first string at the third fret.

But any time I tried that in my lead-sheet, all it would display was the standard A chord. The only way I could display an A7 chord was to use the standard one.

Can anyone suggest how I'm going wrong?

Thanks,

Gordon+


-- 
Fr. Gordon Gilbert
Penetanguishene, ON