Hi Robert,
I cloned the git repository and compiled the Larsen symbols. I all works beautifully with the current highest revision of lilypond 2.19.81, even though the code is somewhat old.
Here's the result of the test code attached as an image.
The code fr this is not hard to understand:
====
\version "2.19.81"
\include "larsen-symbols.ily"
\time 2/4
{
b'2\cut
b'\strike
b'\slideUp
b'\slideDown
b'\longRoll
b'\shortRoll
b'\longDoubleCutRoll
b'\shortDoubleCutRoll
b'\crann
b'\shortCrann
b'\trill
b'\singleTrill
b'\shake
b'\breathe
}
====
I'd really recommend you go with lilypond as it is incredibly powerful - witness this extension as an example - and it does not take long to learn the basics.
Andrew