Re: unfoldrepeats makes midi tracks follow one another

[Mats Bengtsson]

The problem is how you apply \unfoldrepeats. Actually, apart from
unfolding the repeats, what you actually do is to say

\score {
 <<
  {
   \new DrumStaff { \drumContents }
   \context Staff = trombone \trombone
  }
 >>

Since you have an {...} directly inside the <<...>>, the
<<...>> will only contain a sequence of drum notes followed by
the trombone notes.

I haven't tried, but I'm sure that the following should work
as you expect.
\score {
 \unfoldrepeats <<
   \new DrumStaff { \drumContents }
   \context Staff = trombone \trombone
 >>


  /Mats

John Comeau wrote:
> I'm probably doing something wrong, but have tried several
> permutations of wrapping things inside one another with the same
> result: the tracks follow one another in the MIDI output though the
> graphical representation is correct. Googling and searching archives
> for unfoldrepeats turns up nothing of value that I could see.
>
> downtown_sandiego.ly:
>
> tromboneNotes = \relative c {
>  c16 c c8-. r c16 c d d d8-. r d16 d e e e8-. r e16 e f f f8-. r f16 f
>  e16 e e8-. r e16 e d d d8-. r d16 d e e e8-. d16 d d8-. e16 e e8-. d16 d d8-.
> }
> trombone = {
>  \time 4/4
>  \set Staff.instrument = #"Trombone"
>  \set Staff.midiInstrument = "trombone"
>  \clef bass
>  \repeat volta 2 {
>   \context Staff <<
>    \tromboneNotes
>   >>
>  }
> }
> drumNotes = \drummode {
>  hh8 sn hh sn hh sn hh sn hh8 sn hh sn hh sn hh sn
>  hh8 sn hh sn hh sn hh sn hh8 sn hh sn hh sn hh sn
> }
> drumContents = {
>  \set DrumStaff.instrument = #"Drums"
>  \repeat volta 2 {
>   \time 4/4 <<
>    \new DrumVoice { \voiceOne \drumNotes }
>   >>
>  }
> }
> \score {
>  <<
>   \context Staff = trombone \trombone
>   \new DrumStaff { \drumContents }
>  >>
>  \layout { }
> }
> \score {
>  <<
>   \unfoldrepeats {
>    \new DrumStaff { \drumContents }
>    \context Staff = trombone \trombone
>   }
>  >>
>  \midi { \tempo 4=120 }
> }
>
> Dump of downtown_sandiego.midi (http://jcomeau.com/src/midi/midi.py,
> symlink to mididump)
>
> [ # midi file dump
> [ # dump midi header
> 'MThd',
> 6, # chunk length
> 1, # MIDI file format
> 3, # Tracks
> 0x180, # Time Division
> ], # end of midi header dump
> [ # midi track 1
> 'MTrk',
> 248, # chunk length
> [0, 0xff, 0x1, 39, 'Creator: GNU LilyPond 2.4.2            '],
> [0, 0xff, 0x1, 58, 'Generated automatically by: GNU LilyPond 2.4.2            ']
> ,
> [0, 0xff, 0x1, 60, 'at Sun Jan  9 16:22:19 2005
> '],
> [0, 0xff, 0x1, 60, 'at Sun Jan  9 16:22:19 2005
> '],
> [0, 0xff, 0x3, 7, 'Track 0'],
> [0, 0xff, 0x2f, 0, ''],
> ], # end midi track
> [ # midi track 2
> 'MTrk',
> 625, # chunk length
> [0, 0xc9, 0], # change instrument for channel 9 to Acoustic Grand Piano
> [0, 0xff, 0x4, 5, 'drums'],
> [0, 0x99, 0x2a, 0x7f], # Note On, "gf,", channel 9, velocity 127
> [0, 0xff, 0x58, 4, '\x04\x02\x12\x08'],
> [0, 0xff, 0x3, 14, 'uniqueContext2'],
> [0, 0xff, 0x51, 3, '\x07\xa1 '],
> [192, 0x89, 0x2a, 0x40], # Note Off, "gf,", channel 9, velocity 64
> [0, 0x99, 0x26, 0x7f], # Note On, "d,", channel 9, velocity 127
> [192, 0x89, 0x26, 0x40], # Note Off, "d,", channel 9, velocity 64
> [0, 0x99, 0x2a, 0x7f], # Note On, "gf,", channel 9, velocity 127
> [192, 0x89, 0x2a, 0x40], # Note Off, "gf,", channel 9, velocity 64
> [0, 0x99, 0x26, 0x7f], # Note On, "d,", channel 9, velocity 127
> [192, 0x89, 0x26, 0x40], # Note Off, "d,", channel 9, velocity 64
> ...[snip]
> [0, 0xff, 0x2f, 0, ''],
> ], # end midi track
> [ # midi track 3
> 'MTrk',
> 751, # chunk length
> #
> # *** NOTE DELTA OF NEXT EVENT -- trombone follows drums! ***
> #
> [12288, 0xc1, 57], # change instrument for channel 1 to Trombone
> [0, 0xff, 0x4, 8, 'trombone'],
> [0, 0x91, 0x30, 0x7f], # Note On, "c", channel 1, velocity 127
> [0, 0xff, 0x58, 4, '\x04\x02\x12\x08'],
> [0, 0xff, 0x3, 8, 'trombone'],
> [0, 0xff, 0x51, 3, '\x07\xa1 '],
> [96, 0x81, 0x30, 0x40], # Note Off, "c", channel 1, velocity 64
> [0, 0x91, 0x30, 0x7f], # Note On, "c", channel 1, velocity 127
> [96, 0x81, 0x30, 0x40], # Note Off, "c", channel 1, velocity 64
> [0, 0x91, 0x30, 0x7f], # Note On, "c", channel 1, velocity 127
> [192, 0x81, 0x30, 0x40], # Note Off, "c", channel 1, velocity 64
> [192, 0x91, 0x30, 0x7f], # Note On, "c", channel 1, velocity 127
> [96, 0x81, 0x30, 0x40], # Note Off, "c", channel 1, velocity 64
> ...[snip]
> [0, 0xff, 0x2f, 0, ''],
> ], # end midi track
> ] # end midi file
>
>
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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
=============================================