Rotating/grouping grobs for microtonal accidentals

[Torsten Anders]

Dear all,

I would like to define a microtonal notation with alteration  
fractions (cf. http://lilypond.org/doc/v2.11/Documentation/topdocs/ 
NEWS.html) -- thanks for providing this feature! Everything works great.

My only problem is the creation of suitable accidentals. I need four  
additional signs: a comma up (/), a comma down (\), and a combination  
of these signs with the standard accidentals (#\ and b/). I figure I  
could use something like "scripts.lvarcomma" for a comma up. For a  
comma down, however, I need to rotate this sign or  
"scripts.rvarcomma". Moreover, I would like to group my commas with  
the common accidentals. How can I rotate and group feta font symbols  
which I want to add to the list of accidentals.

% code does not work, should only clarify problem
myGlyphs = #'((1 . "accidentals.doublesharp")
        [...]
       (1/6 . "scripts.rvarcomma")
       (0 . "accidentals.natural")
        ;; how can I rotate a symbol?
       (1/6 . (rotate "scripts.lvarcomma"))
        [...]
       )

Thank you!

Best
Torsten

--
Torsten Anders
Interdisciplinary Centre for Computer Music Research
University of Plymouth
Office: +44-1752-233667
Private: +44-1752-558917
http://strasheela.sourceforge.net
http://www.torsten-anders.de