ghost notes

[bernie arai]

hi, i'm new to the list, and been trying to learn lilypond on and off
(first through noteedit, now directly text-editting) for a little
while now.  i'm simply floored by the quality of output (i'm coming
from using finale in windoze to lilypond in fedora)

i'm wondering whether anyone can help me find out if it is possible to
create "ghost notes" in drum/percussion notation, where the notehead
(whatever type it is) is surrounded by parentheses.  i found a post in
the archives of this list asking the same, but there were no replies. 
any news?

thanks in advance,

bernie