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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