Keith, you are correct that I postprocess the MIDI. I actually pipe
Frescobaldi's output to Pure Data via Apple's IAC driver. As long as the
pitches don't overlap MIDI numbers, I can remap them easily in PD. (I'm
using an isomorphic keyboard with its own peculiar keymap.) I am trying to
keep things simple on the PD end, so I prefer your second option. I'll
probably just repeat the pattern I already have. Thanks for your help!
On Sun, Mar 1, 2015 at 10:20 PM, k-ohara5a5a [via Lilypond] <
ml-node+s1069038n172489...@n5.nabble.com> wrote:
> txikitofandango <nickgeorgopoulos <at> gmail.com> writes:
>
> > #(ly:set-default-scale
> > (ly:make-scale
> > '#(0 1 3/2 2 3 7/2 9/2 5 6))
> > )
>
> > Everything looks great, and the MIDI comes out correct within the
> octave,
> with each semitone up the scale going up a MIDI number. EXCEPT, because
> this is a 13-note scale, but MIDI octaves repeat every 12 numbers, I'm
> back
> at square one.
>
> Lilypond is impressively flexible, but does assume that the repeat-period
> of the scale spans 12 semitones in midi.
> (We might be able to change the hard-coded 12s -- actually 6s -- so that
> future users can more easily use scales spanning more than an octave.)
>
> I can see two options.
> 1) Currently it seems your midi pitches meant to span a tritave span only
> an octave, so it seems you intend to post-process the midi before
> listening.
> You can fit more pitches into 12 semitones of MIDI if your post-processing
> can interpret the midi pitch-bend. If you multiply your scale by 12/13
> #(0 12/13 18/13 24/13 36/13 42/13 54/13 60/13 72/13)
> and use 6/13 instead of SHARP, LilyPond generate MIDI with pitch-bends.
> You would have to arrange to have one MIDI channel per voice, so each
> voice gets its own pitch-bend.
>
> 2) You might skip using the ' and , operators, and define pitches to span
> the range of your instruments. CC for low C, then C c cc for the other
> tritaves. The scale in ly:make-scale would be quite long, but I don't
> think that will caus any problem. You could work out the actual pitches
> in terms of 12-divisions-of-an-octave semitones, and the corresponding
> alteration in terms of 12ET semitones for sharp and flat, and have
> LilyPond produce a correct-sounding midi directly.
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