Aaron Hill wrote
> This means your score really should be bar check clean *before* you ever
> use \featherDurations.
>
> At the end of the day, there is no real need to use any math for the
> \featherDurations moment. Any positive rational less than one will
> produce an accelerando, while fractions greater than one generate a
> ritardando. The best thing to do is to listen to the MIDI output and
> determine if it sounds right to your ear.
>
> I said earlier we would talk about bar checks *within* the feathered
> sequence of notes. Consider the following addition to our example:
>
> << { r64 \featherDurations #(ly:make-moment 2/1)
> { c32*127/14[ d e f g a | b] } }
> { r64 \featherDurations #(ly:make-moment 2/1)
> { c32*63/12[ d e f g a] } | b1 }
> { r64 { c64 d32 e16 f8 g4 a2 } | b1 } >>
>
> You'll see that the 'b' is included within the beamed notes. Because we
> now have seven notes covering the period of two measures less one 64th,
> we had to adjust our scaling fraction to 127/14. However, what is most
> important is that \featherDurations fixes the timing of the notes to
> allow the inside bar check to pass. Omit it, and you'll see that the
> bar check fails. But also try changing the 2/1 moment to anything else,
> and the bar check will also fail.
>
> What we have here is a very fragile element in the score that can be
> easily avoided by never requiring any note (apart from the first) within
> a feathered sequence to align to anything else. The final 'b' above
> should properly be outside the feathered sequence (or possibly start a
> new sequence of its own). In this way, the math to ensure all of the
> sequences have the right lengths can be done completely independent of
> \featherDurations.
>
> Hopefully some of this will be helpful.
>
> -- Aaron Hill
>
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The fractions do NOT always accelerando, while fractions greater than one
generate a
ritardando as intended. That is why I began this mess in the first place :))
--
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