Issues compiling multiple voice drum midi

[hendr611]

This issue may be too elementary for this mailing list or may have already 
been addressed, however I cannot find answers in digging through the 
archives and am not sure where to ask more basic questions. If I need to be 
re-directed to another area please don't feel afraid to tell me to go away, 
i'd just appreciate a little push in the right direction.

The issue I'm having is making a midi out of a piece of drum music that 
contains two voices. I'm quite sure that the problem would persist in 
non-percussion music but I don't have experience trying that. I can compile 
a midi file from code that contains no voice voice tags, but once I make 2 
voices it compiles a midi file with no sound. To use the example in the 
manual:

\score {
    \new DrumStaff <<
      \new DrumVoice = "1" { s1 *2 }
      \new DrumVoice = "2" { s1 *2 }
      \drummode {
        bd4 sn4 bd4 sn4
        <<
          { \repeat unfold 16 hh16 }
          \\
          { bd4 sn4 bd4 sn4 }
        >>
      }
    >>
\midi { }
}

When compiled as a PDF it will correctly make two measures of drum music 
one being: \drummode { bd4 sn4 bd4 sn4 ...... }

and the next: 
.... { \repeat unfold 16 hh16 } \\ { bd4 sn4 bd4 sn4 }.... 

However, when compiled as a midi it will only make the first measure of 
music "bd4 sn4 bd4 sn4". It does not leave empty space where the next 
measure would be, it simply does not compile it. Is there something I'm 
missing or is this a bug?


I am currently using lilypond version 2.10.33 as the manual for 2.10 is the 
only one I can find instructions for entering percussion in. Perhaps this 
has been changed in the updates of the language, does it compile for any 
one else?

--
Levi Hendricks - UMN Student of Mortuary Science