On 20/09/10 14:41, Hans Aberg wrote: >> As a related issue, have you considered how (different kinds of) >> transposition would be handled in your pitch scheme? > > > This is much simpler: the linear combinations are vectors that you > just add. For example, if a, b, c, ... are represented by 0, M, m+M, > ..., and you want to transpose from b to c, just add m. A sharp is M-m > and a flat m-M. If you want transpose from a note x to a note y, just > add y - x. What you've missed (and I need to address) is "what is x?".
Let's say I want to transpose up three semitones. That's probably easy, it's a minor third, but it could be an augmented second. So, trying to remember the pitch class, is it (0,2,sharp) or (0,3,flat)? And, for your example of that, I've currently got a modified chord engraver on the frogs list that's added a guitar capo property. All the engraver is told is how many semitones to transpose, and it's got to sort out all the keys! Cheers, Wol _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org http://lists.gnu.org/mailman/listinfo/lilypond-devel
