Re: Incorrect interpretation of grace notes in MIDI

[Mats Bengtsson]

This is a known old bug, see the file midi-grace.ly in the bug collection,
http://savannah.gnu.org/cgi-bin/viewcvs/lilypond/lily-bugs/bugs/
(since the bug isn't visible in the printed output, it seems that the
example is not included at http://lilypond.org/bugs/v2.7/).

  /Mats

liang seng wrote:

> Hi, I discovered that sometimes grace notes aren't interpreted 
> incorrectly in MIDI generated by Lilypond.  Here is an extract from 
> the file:
>
> \version "2.7.18"
> global = { \key b \minor
> \time 3/4 }
> \score {
> \relative
> \new StaffGroup <<
> << \new Staff {
> \set Staff.midiInstrument = "flute"
> \global d'8.[\( \grace { e32[ d cis d] } e16]\) \grace eis4 fis4 fis g 
> g g } >>
> << \new Staff {
> \set Staff.midiInstrument = "violin"
> \global fis,8 b d b fis b g b e b g b } >> >>
> \midi { \tempo 4=60 }
> \layout { }
> }
>
> Here, the MIDI interpreted the first grace note of the flute part 
> incorrectly, resulting in the timing of the flute part being slowed by 
> about half a beat. This is very apparent as when the 2nd bar is heard, 
> the flute part is distinctly delayed and off-beat. There is no problem 
> at all with the violin part MIDI. Is this a bug?
> Thank you.
>
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>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
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