Comment #1 on issue 2475 by [email protected]: GSoC page hammer-on and pull-off are already implemented
http://code.google.com/p/lilypond/issues/detail?id=2475
In a later post Frederico gives further clarification.Lilypond currently implements slurs in tablature. Musicians can interpret rising slurs as a hammer-on and falling slurs as a pull-off.
http://lists.gnu.org/archive/html/bug-lilypond/2012-04/msg00044.html Cheers, Colin.
