Percussion flams and ruffs and MIDI generation

[Pete Stieber]

I've been able to create a flam notation I like using

\override Stem #'length = #4
\acciaccatura {sn8}
\revert Stem #'length
sn4

and a two-stroke ruff using

\grace {
  \override Beam #'position = #(2 . 2)
  {sn16[( sn]}
  \revert Beam #'positions
}
sn4)

and a three stroke ruff using

\grace {
  \override Beam #'position = #(2 . 2)
  {sn16[( sn sn]}
  \revert Beam #'positions
}
sn4)

but they do not produce MIDI output. Is there a way around this?

TIA,
Pete