Re: [Lilypond-auto] Issue 1278 in lilypond: Enhancement: arrow notation for quarter-tones

[lilypond]

Updates:
        Labels: Needs-design

Comment #8 on issue 1278 by address@hidden: Enhancement: arrow  
notation for quarter-tones
http://code.google.com/p/lilypond/issues/detail?id=1278

Well, it succeeds for B-flat-lowered Clarinet, and fails for B-half-flat  
Clarinet in a very friendly way:
  warning: Could not find glyph-name for alteration 3/5
And the snippet has a very friendly comment showing the resolution
  % Transposition could generate pitches with alterations
  %  double-sharp-lower (8/10) or double-flat-raise (-8/10)
  %  but there are no such symbols in the font, so we substituted
  %  the most appropriate symbols.
  % If some pitch in your score has no symbol, LilyPond gives a warning.

Fundamentally, if you want quarter-tone pitches to sometimes maintain a  
distinction
  "C-sharp-lower distinct from C-natural-raise"
but ignore other distinctions
  "F-sharp-lower transposed by a sharp-lower would be  
E-double-sharp-double-lower,
   but just use F-sharp for that"
then you need a way to describe your notation system to LilyPond.

The current way to describe such a system is to make the pitches  
numerically distinct, and tell LilyPond which glyphs to use for the  
numerical pitches that could arise in practice.

Note that the patch in comment #1 stores a quarter sharp, transposed up by  
a quarter tone, as 2/4, which is kept distinct from 1/2.  In that system,  
similarly, one needs to tell LilyPond whether 2/4 should be printed with a  
sharp, or alternatively a user-defined double-up-arrow.

Attachments:
        1278.png  53.7 KB

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