Neil -- thanks ever so much for the detailed explanations.
> Take a look at lily/music.cc to see where the transposition takes place.
The transpose_mutable() function seems to be where it's at ... :-)
I note the following lines which are surely responsible for cleaning up
anything larger than a double flat:
if (transposed.get_alteration ().abs () > Rational (1,1))
{
string delta_str;
if (delta.get_alteration ().abs () > Rational (1, 1))
delta_str = (delta.normalized ().to_string ()
+ " " + _ ("(normalized pitch)"));
else
delta_str = delta.to_string ();
warning (_f ("Transposing %s by %s makes alteration
larger than double",
p->to_string (), delta_str));
transposed = transposed.normalized ();
}
So, thinking about the way to implement the various chromatic
transpositions, what seems natural is that once new_val has been
generated in the transpose_mutable() function, to run through one of the
naturalize-pitch Scheme functions (or perhaps a C++ version of it).
Anyway, first port of call, I'm going to try and implement those toohigh
and toolow options for the naturalize-pitch Scheme function...
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