Re: adjusting vertical positions of start and end of tie

[Brian Barker]

At 15:59 06/08/2020 -0700, Aaron Hill wrote:
> On 2020-08-06 3:34 pm, Werner LEMBERG wrote:
> > Look at this example
> >
> >   \relative c' {
> >     \clef "alto" d'2 \tweak positions #'(8 . 4) ~
> >     \clef "treble" d2
> >   }
> >
> > The `\tweak positions` doesn't work ­ which is 
> > kind-of expected. However, for this very 
> > situation it would be nice if I could change 
> > the start and end position of the slur manually.
> >
> > Of course, it would be even better if LilyPond 
> > could handle this situation automatically :-)
>
> I have never encountered this scenario before, so I am quite curious.
> What is the correct behavior?  (I need to pick 
> up a copy of Gould's book, though that presumes she has addressed this.)

She has - on page 9.

> I see at least three options:
>
> - The tie should be sloped like a slur.
> - The tie should be split into a two halves 
> (possibly dotted/dashed), each half attached to 
> the terminal notes but individually still 
> horizontal to keep it distinct from a slur.
> - The tie should be rendered as a \laissezVibrer and \repeatTie combination.

Gould writes "Avoid changing a clef during a tied 
note, as the tie will look cumbersome. If this 
cannot be avoided, the clef is best changed at a 
system break". She gives three examples:

o "recommended" has the tie split across a system 
break at the same vertical position, with the 
clef change delayed until after the second part of the tied note.

o "acceptable" has the clef change at the system 
break, with each part of the tie being horizontal 
and appropriately positioned to its note - in 
different positions vertically, that is.

o "incorrect" has a tie winding its way from one 
vertical position to another, in the process wrapping around the new clef sign.

See https://preview.tinyurl.com/tieClefChange (page 9).

Brian Barker