Dead notes

[Werner Trobin]

Hi!

I've been using Lilypond for quite a while now, but I never found out how to 
enter a "dead note" (e.g. the "thud" you get when you pluck a string on a 
bass guitar while lightly laying the fingers on the string). Normally people 
use the cross symbol (like for a hihat in drum notation) but with the 
appropriate "pitch".

I'm not interested in correct midi output, I just want to see that cross on 
the paper :-)

Thanks in advance,
Werner