Muted (Stopped) notes in Tablature

[Christopher Giroir]

Howdy, I've recently started using Lilypond to transcribe my band's 
current music. I wanted to add tablature to guitar parts that have 
stopped (muted) notes. I have a macro that changes the note head to a 
cross that works fine when my guitar notes variable is fed into a normal 
staff, but in a TabStaff the notes are displayed normally with numbers.

I found out how to replace the Tab function so that I can set the tab to 
always display an "x" instead of the number, but this seems like a hack 
and also doesn't look quite right since the real music with a nice 
looking cross note is right above it.

Is there anyway to highjack the Tab transcriber for a second and make it 
display a normal cross note?

Thanks,
Kelsin