TabStaff and midi

[Joshua McFadden]

I've been searching the documentation and googling for an hour
now... is there _any_ way to get TabStaff to output a midi track?

Here's a short example, and when I run lilypond on it (2.1.0 on
Debian), the Staff and Lyrics wind up in the midi file, and the
TabStaff doesn't:

\score {
  <<
    <<
      \addlyrics
      \context Staff = melody { \clef "G_8" \melody }
      \context Lyrics = words { \words }
    >>
    \context TabStaff = accp { \accp }
  >>
  \paper { }
  \midi { \tempo 4 . = 55 }
}

The full source is here:
http://mindsound.org/junk/tabstaff.ly

Thanks,
-- 
Joshua McFadden
http://mindsound.org/