trills and trill spanners with accidentals

[Reinhold Kainhofer]

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I'm looking for an easy and general way to add a flat sign to the "tr" of a 
\trill and of a trill spanner. In particular, I'd need to define two 
articulations
  \flatTrill and \sharpTrill
that generates an articulation with "b tr" and with "# tr". And then I need 
the same for trill spanners, i.e.
  \startFlatTrillSpan and \startSharpTrillSpan
that procude trill spanners with "b tr" and "# tr" texts. The example in the 
LSr doesn't seem to work any more with 2.13, and the NR is completely quiet on 
this issue :(

Thanks a lot for any help!

Cheers,
Reinhold
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org
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