Re: trillspan issue

[Gilles]

> Thanks for the hack, it doesn't work quite right. 

This is because you have to adapt the construct to the
actual bar content.  In

  << { music_a } { music_b } >>

The duration must be equal in "music_a" and "music_b" or
you'll have bar check failures (and/or the music will not
look like you would expect).

E.g. for the bar with the half-note:

  | a4-> <<{c,2.->(\startTrillSpan}{s2 s4 s8 s16 s32 s32\stopTrillSpan}>> |

Here the duration of "music_a" is "2." while for "music_b" it is "1".
Hence, you should write:

  | <<{ a4-> c,2.->(\startTrillSpan}{s2 s4 s8 s16 s32 s32\stopTrillSpan}>> |


Gilles