Re: volta questions

[Graham Percival]

J.P. Mellor wrote:
> Sure thing!  Attached are much shorter examples.

Thanks, there are much easier to analyze.

> volta_test1a.ly - missing vertical line segment on the right side of
>                   the volta bracket.

This isn't done in printed music.  There is some logic in this -- the 
music doesn't stop after the 2nd time ending -- but to be completely 
logical the left-most vertical segment of the 1st time ending should 
also be missing (since music doesn't start at the 1st time repeat).

Anyway, regardless of the internal consistency (or lack thereof) of 
Western music, LilyPond's behavior here is not a bug.

> volta_test1b.ly - with a single alternative the final bar of the
>                   alternative is not printed as a repeat bar.

Hmm.  If you modify your file like this,
  %  \alternative { { a'1 | } }
    \alternative { { a'1 | } {a'1 }}
you get the result you wish.  I'm not convinced this is a bug, either -- 
if lilypond _did_ add a repeat in the first case, then it would 
logically apply after the 2nd time repeat as well.  Then the poor 
musicians would get into an infinite loop.  :)


> I don't think either of these is behaving as they should.
>
> volta_test2a.ly and volta_test2b.ly - highlight functionality that
>                   I'd like to see.  I'm not sure what the best way to
>                   achieve this is.

I'm not sure what you're trying to do with this:
\repeat volta 2 {
  a'2 a'2 |
  \set Score.repeatCommands = #'((volta "1"))
  b'2
  \set Score.repeatCommands = #'((volta #f) (volta "2"))
  d''2
  \set Score.repeatCommands = #'((volta #f))
  b'2 |
  c''2 c''2 |
}

Are you just trying to get a half-bar alternative repeat?  If so, you 
could fake it by adding an s2 (or maybe even s2*0) to your alternatives.

Cheers,
- Graham