changing the font of moderntab clef

[Rachael Thomas Carlson]

Hello All:

I am working on emulating a music publisher and this publisher uses what 
we would consider a moderntab clef but with a serif font not the 
sans-serif that we use.  I have tried a bunch of different ways of 
changing the font but I can't seem to get it.  Also, I looked in the 
code to try to find where the font was chosen but to no avail.

How can one change the font of the moderntab clef from sans-serif to serif?

Thank you,
Rachael