Re: Mapping pitches to other pitches when generating MIDI files for percussion?

[Aaron Hill]

On 2018-11-12 7:22 pm, Vinicius Mascarenhas wrote:
> TLDR: I need to map different pitches displayed in the layout block /
> PDF file to a single sound in the midi block / file (like say map both
> c and a to b,) but I can’t to that to the whole staff — I need to be
> able to map other sets of pitches to another single sound. Can
> Lilypond do this?

Sounds like what could work is to define your own drum pitch names.  
These would have different visual appearance in the notation but can map 
to the same MIDI note.  See the following:

http://lilypond.org/doc/v2.19/Documentation/snippets/midi#midi-customize-drumpitchnames-drumstyletable-and-drumpitchtable-in-layout-and-midi

Here is a adaptation of that snippet for a simple left-hand and 
right-hand taiko where the left-hand marking lies below and the 
right-hand above.

%%%%
\version "2.19.82"

drumPitchNames.taikolefthand  = #'taikolefthand
drumPitchNames.tlh            = #'taikolefthand
drumPitchNames.taikorighthand = #'taikorighthand
drumPitchNames.trh            = #'taikorighthand

#(define taikoStyle
  '((taikolefthand  default #f -1)
    (taikorighthand default #f  1)))

midiDrumPitches.taikolefthand = e
midiDrumPitches.taikorighthand = e

\score {
  \new DrumStaff
  \with {
    \override StaffSymbol.line-count = #1
    instrumentName = #"Taiko"
    drumStyleTable = #(alist->hash-table taikoStyle)
    drumPitchTable = #(alist->hash-table midiDrumPitches)
  }
  \drummode {
    \set Staff.midiInstrument = #"taiko drum"
    \tempo 2 = 60
    tlh4. trh16 tlh trh2 | tlh8. tlh16~ 8 tlh trh2
  }
  \layout {}
  \midi {}
}
%%%%

-- Aaron Hill

taiko.cropped.png
Description: PNG image

taiko.midi
Description: MIDI audio