There is no key signature in the generated Midi file ?

[Esko Teerilahti]

Hi !

I noticed that there is no key signature in the midi file. When imported to 
other music software (e.g. Finale Songwriter), it assumes the music to be in C 
major.
In the case, for example, my piece is in A Major,  key signature and 
accidentals are not correct in the chart (in Finale).
However, the music plays ok.

So, is this a bug, missing feature, or are there some properties that can be 
set in the lilypond file ?
(like there is e.g  midiInstrument)

Using version 2.18.2

BR
Esko