Rhythmic staff MIDI

[ebenezer]

Hello everyone,

I am attempting to use a percussion staff for a bongo part in a score.

staffBongo = \drummode {

  boh4_\markup { \sans boh }  boho8 bohm8  % --  and so on...

}

partBongo = \new RhythmicStaff \with {

} \staffBongo

doesn't output any MIDI. Note that using a DrumStaff works fine. The contexts under \midi {} are the same for both DrumStaff and RhythmicStaff. What am I doing that is incorrect, please?

Thanks.