Issue 748 in lilypond: Modes should support quarter-tones

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Status: Accepted
Owner: v.villenave
Labels: Type-Defect Priority-Medium

New issue 748 by v.villenave: Modes should support quarter-tones
http://code.google.com/p/lilypond/issues/detail?id=748

\version "2.12.1"

% A mode that contains a quarter tone generates the warning:
% "warning: No ordering for key signature alterations"

% and if a \midi { } statement is included this error is also generated:
% "lily-library.scm:149:5: Wrong type (expecting exact integer): -1/2"

% Here's a minimal file to demonstrate the problem:

mode = #`((1 . ,SEMI-FLAT))
\score {
 \relative c'' {
  \key c \mode
  c4
 }
\layout { }
\midi { }
}

% This example is musical nonsense, but the same construct is
% used, for example, in the bayati mode in ly/arabic.ly, and
% generates similar errors.


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