Hans Aberg wrote:
>> What you see is that
>>
>> (i) without naturalizeMusic, transposition fails: transposition alone
>> leaves the final pitch being 'g+5/4' which has no accidental
>
> I think is just a bug. Somehow the sharp drops out.
It's not so much a bug as a notational impossibility.
Think of pitch as being staff position s plus alteration a. The latter
is used to determine the accidental. So in this case we're dealing with
a base pitch of g+1, which is displayed as g-double-sharp.
Now you transpose it up a quarter-tone, so all pitches are altered by
+1/4. Your pitch is now g+5/4 and there is no accidental for +5/4 so of
course one can't be displayed.
So, if there _is_ a bug, it's that Lilypond doesn't recognise that an
alteration of >1 should change the staff position.
> Here, the most obvious thing for a machine to do, is to merely impose E12
> enharmonic equivalents in order to minimize the number of accidentals. So the
> problem is to figure out a rule for the changes.
Yup. It's a not-entirely-trivial problem. For example, you want to
preserve things like the notated g-three-quarters-flat which
naturalizeMusic destroys, but you want to avoid ridiculous notations
like E-three-quarters-sharp or C-three-quarters-flat.
But anyway, THAT I think I can do. The question is, how to incorporate
a well-defined chromatic transposition rule as an option in Lilypond as
opposed to a function à la naturalizeMusic?
Thanks & best wishes,
-- Joe
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