Re: Extract notes from chords, with silence when there are none

[Thomas Morley]

2015-09-16 17:20 GMT+02:00  <address@hidden>:
> On Wed, 16 Sep 2015, David Kastrup wrote:
>> > Just to clarify, in the case of 3-voice music, how would you expect it to
>> > deal with a 2 note chord?
>> >
>> > One note to Treble, one to Bass, or one in Treble, one in Alto, or... what?
>>
>> As I read him, he does not care.  First note anywhere, second note
>> anywhere else, skip in the remaining expression.  This is for midi.
>
> That's right.  I just want any two notes that play simultaneously to be
> returned by separate index values into the extraction function, and any
> other index values to return something that will be silent (either a skip
> or a rest).  The typesetting of human-readable score will be from the
> original single polyphonic voice; the splitting is only for MIDI, only to
> separate the pitch-bend data for different notes, and the split channels
> will be played using identical settings, so the exact assignment of notes
> to index values (channels) can be arbitrary.
>
> I would expect that the easiest way to do the note assignment would be
> what I described in my initial message - change the "extract" script to
> return silence instead of the last note in the data structure, when the
> index is greater than the number of notes.  Then with two simultaneous
> notes they will be returned by index values 1 and 2, and silence returned
> by index 3.
>
> I don't need to deal with cases like << { d''1 } { c'2 c'2 } >>, because
> the input really is a single polyphonic voice.  Notes will all start and
> stop together, only the number of notes changes.
>
> FWIW, I'm aware of the script at http://x31eq.com/lilypond/, which
> attempts to do better microtonality with LilyPond and MIDI Tuning Standard
> messages, but it's not suitable for my needs because I'm sending the data
> to a very simple MIDI device that doesn't understand MTS, only pitch bend.
> (And I think it would require separating the notes into channels first
> anyway.)
>
> --
> Matthew Skala
> address@hidden                 People before principles.
> http://ansuz.sooke.bc.ca/
>
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Is my recent coding here:
http://www.lilypondforum.de/index.php?topic=2080.msg11479#msg11479
of any help?

You probably will not understand the german text, thus: I express my
concerns that it will return warnings, if spanners like Ties, Slurs
etc are in the game.


HTH,
  Harm