Re: Microtonal midi output

[Lukas-Fabian Moser]

Hi Jean,
> (let* ((tones (ly:pitch-tones pitch))
>                     (r (ly:moment-main
>                          (ly:moment-mod
>                            (ly:make-moment tones 0)
>                            (ly:make-moment 6 0))))

... using LilyPond's moment-arithmetic (number on the time axis) to deal 
with non-integer tone counts (numbers on the pitch axis) seems to me 
like a reasonable contender for an obfuscated Lily coding contest. :-) 
But impressive it is.

Maybe it's worth pointing out that your solution hardwires enharmonic 
identification (if I'm not mistaken). Of course I don't know what the OP 
intends to do, but in lots of real-life applications for re-tuning it's 
worth keeping the difference between f-sharp and g-flat alive.

As Graham pointed out, LilyPond's habit of setting pitch bends before a 
note and re-setting it immediately after a note whose alteration is not 
in 1/2 * Z leads to strange effects with the release (or reverb) of a 
note. This can be observed in examples involving rests between re-tuned 
notes. I patched my LilyPond for this: Now it never explicitly resets 
MIDI pitch bends, instead each and every note gets a pitch-bend command. 
(Which would be crazy for most applications, but is fine for my special 
needs involving lots of re-tuned notes.) I didn't have time to find out 
how to make this user-configurable. - I'm already looking forward to 
Graham's solution to this problem (post-processing the MIDI files using 
MTS messages.

Lukas