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Short ottava ambiguity

From: Simon Albrecht
Subject: Short ottava ambiguity
Date: Fri, 22 Aug 2014 17:04:08 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.0


as a followup to the ly-user thread on ottavation bracket/fermata stacking I noticed the following problem: By default, OttavaBracket has a minimum-length of 1 and the text is right-aligned to the first note in the range of the ottavation. Thus, it's sometimes impossible to discern from which note on the ottava is supposed to be applied. In short-ottava.ly (see attachment) the ottava applies to both notes, in short-ottava-2.ly only to the second note. Yet the output is identical. My search for occurences of this issue in <http://imslp.org/wiki/Etudes,_Op.25_%28Chopin,_Fr%C3%A9d%C3%A9ric%29> gave the five image examples in the attachment: The Peters (ex1-3), Breitkopf and Bote&Bock (ex4) engravings all have only 8 as ottava text, which considerably easies the problem, and except for Peters they didn't use ottava for a single note in this case I found (see ex1 for Peters' ottava on one note [excluding the grace note!] and 4 for the same note in Bote&Bock without ottava). Another possibility I recall from experience is leaving out the bracket and placing "8va" centered or left-aligned on the note.
What do the authorities Gould and Ross say?
This is closely related to <https://code.google.com/p/lilypond/issues/detail?id=3690>, but I decided to post it here in order to ask for your opinions and because it's not only about alignment.

Best regards,

Attachment: short-ottava.ly
Description: Text Data

Attachment: short-ottava-2.ly
Description: Text Data

Attachment: short-ottava.png
Description: PNG image

Attachment: short-ottava-2.png
Description: PNG image

Attachment: ex1.png
Description: PNG image

Attachment: ex2.png
Description: PNG image

Attachment: ex3.png
Description: PNG image

Attachment: ex4.png
Description: PNG image

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