Re: MIDI commands are not emitted in repetitions

[Aaron Hill]

On 2021-11-22 11:15 am, Bruno wrote:
> Hi all,
>
> I have been working on chord charts which I wanted to use as the input 
> for
> my arranger to generate MIDI backing files, I wanted to use Program 
> Change
> messages to switch the sections of the auto-accompaniment. While trying 
> to
> achieve that I found the following bug:
>
> % somewhere in the included file:
> pc_fillB =  \set Staff.midiInstrument = #"pad 1 (new age)"
>
> % in the file itself:
> intro = \chordmode {
>     \repeat percent 2 { c1 a:m f \pc_fillB g }
> }
>
> In the resulting MIDI file the Program Change message is sent only 
> once, at
> the beginning of the 4th bar. All the 8 bars of notes are generated
> properly. Yes, I understand that Lilypond is *not* a MIDI sequencer :-)
>
> Thanks in advance for the time of everyone who cares to look into it.

Did you forget to \unfoldRepeats?  The following works fine for me:

%%%%
\version "2.22.0"
\include "articulate.ly"

instrA = \set Staff.midiInstrument = #"acoustic grand"
instrB = \set Staff.midiInstrument = #"flute"
instrC = \set Staff.midiInstrument = #"string ensemble 1"

music = { \repeat percent 2 { \instrA b'4 \instrB 4 \instrC 2 } }

\score { \music \layout { } }
\score { \articulate \unfoldRepeats \music \midi { } }
%%%%


-- Aaron Hill