Issue 1750 in lilypond: Documentation suggestion: transposition resulting in triple accidentals

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation Priority-High

New issue 1750 by address@hidden: Documentation suggestion:  
transposition resulting in triple accidentals
http://code.google.com/p/lilypond/issues/detail?id=1750

--snip---

together with Janek Warchol I ran into trouble transposing harmonically  
complex music.
In order to transpose a piece from e flat to c sharp minor we had to first  
transpose a middle section enharmonically (\transpose e fes) because it  
would otherwise end up having an untolerable amount of double sharps.
This gave us a few erroneous results that we had difficulties to track down.

Now I found the reason, and it is that \transpose won't produce triple  
accidentals.
I think this isn't a bug, as triple accidentals don't exist in Lilypond.
But unfortunately the warnings issued by lilypond don't refer to line  
numbers and are therefore difficult to interpret and didn't lead us to the  
source of the error.

Therefore I'd suggest the following addition to the docs:

---
In NR 1.1.2 (Changing multiple pitches)
At the very end of the section "Transpose"
Please add the following paragraph to "Issues and warnings":

    If \transpose is in a situation where it should produce triple
    accidentals (which it can't) it will use an enharmonically
    equivalent pitch instead (e.g. des instead of eseses). This works on
    individual notes so it will lead to an inconsistent result as only
    some of the notes are affected.

---

Alternatively one could insert a paragraph into the normal section, dealing  
with the use of \transpose to enharmonically change the music and putting  
the note about triple accidentals in this paragraph.
If you think this is more useful, I will write another documentation  
suggestion.

Best
Urs
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