On 11-11-04 03:26 PM, Raphael Frey wrote:
Hey there!

There are at least three ways to enter polyphonic percussion music (see 
examples below). However the first (easiest) approach does not produce any Midi 
output in polyphonic parts.

% first example - no midi output starting from bar 2
\version "2.14.2"
\score {
   \new DrumStaff<<
     \drummode {
       bd4 sn4 bd4 sn4
       <<  {
         \repeat unfold 16 hh16
       } \\ {
         bd4 sn4 bd4 sn4
       }>>
     }
   >>
   \midi { }
   \layout { }
}


% second example - no problem here

\version "2.14.2"
\score {
   \new DrumStaff
     \new DrumVoice {
       \drummode {
         bd4 sn4 bd4 sn4
         <<
           {
             \voiceOne
             \repeat unfold 16 hh16
           }
           \new DrumVoice {
             \voiceTwo
             bd4 sn4 bd4 sn4
           }
         >>
       }
     }
   \midi { }
   \layout { }
}


% third example - no problem here
\version "2.14.2"
\score {
   \new DrumStaff<<
     \new DrumVoice {
       \drummode {
         \oneVoice
         bd4 sn4 bd4 sn4
         \voiceOne
         \repeat unfold 16 hh16
       }
     }
     \new DrumVoice {
       \drummode {
         \voiceTwo
         s1 bd4 sn4 bd4 sn4
       }
     }
   >>
   \midi { }
   \layout { }
}


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Thanks for the report, Raphael! Added as Issue 2022 <http://code.google.com/p/lilypond/issues/detail?id=2022>: MIDI percussion lost in implicit voices

Cheers,
Colin Campbell
Bug Squad

--
I've learned that you shouldn't go through life with a catcher's mitt on both 
hands.
You need to be able to throw something back.
-Maya Angelou, poet (1928- )

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