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Re: tie over clef change

From: Hans Åberg
Subject: Re: tie over clef change
Date: Sat, 26 Sep 2020 20:30:17 +0200

> On 26 Sep 2020, at 19:56, Werner LEMBERG <> wrote:
>>>> The notes d♯ to e♭ have different pitches in the staff notation
>>>> system, which cannot express E12 enharmonic equivalents, so this
>>>> is slur. So it should be a slur that looks like slur.
> I disagree.  For all practical purposes in standard classical music,
> enharmonic equivalents *do* sound the same.  What you are referring to
> IMHO is a special case that might be controlled by a flag.

They do not, and the string section, that primarily stands for the pitch 
reference, trains to slide the pitch appropriately:

In the video below, time 10:43, Brett mentions that the E (on the D string) 
against the open G, the sixth, is a bit lower than against the open A; the pure 
fourth. This is the syntonic comma 81/80, the difference between the Just 
Intonation major third 5/4, and the higher Pythagorean major third.

This is for adjusting towards Just Intonation, but it is necessary for 
enharmonic equivalents too, as the Pythagorean comma is the microtonal amount 
they use in Turkish music. A melody line will not sound right if not adjusted.

>> I can think of special cases: Perhaps the tie and the slur are
>> rendered slightly differently, say of different thickness, so in
>> Werner's example it should be a tie in style.  Somebody might want
>> to indicate an E12 enharmonic equivalence, as in your example, even
>> though it is not so in the staff notation system, and then it should
>> be a tie in style.
> As mentioned above: This might be controlled by a flag.  Or maybe a
> special “E12_tie_slur” engraver can handle this.

You probably think of how to handle it internally, because syntactically one 
might just write a tie between enharmonic equivalents.

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