How do I draw ghost notes in ABC notation?

Question

Fairly straightforward question. I can't seem to find it in the standard or the docs. Perhaps it's just a matter of terminology.

Basically, what I'm looking for is this:

Or, more precisely, the ghost notes as written down for drums - a note head in parentheses.

Source: Wikipedia, Image

Answer 1

According to section 4.19 Annotations of the ABC Standard, you can place parentheses around a note with the following code:

"<(" ">)" C

For example,

X:0
M:none
K:none
"<("">)"C2