addressing ties in a chord

[Flaming Hakama by Elaine]

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For kicks and giggles, I attempted to reproduce an example of tie
formatting
that appeared on the fb music engraving tips page.

The favored rendering was from Dorico:
https://www.facebook.com/photo.php?fbid=10160558409140005&set=pcb.1940968102868739&type=3&theater&ifg=1

And someone else posted a default lilypond mwe version:
https://www.facebook.com/photo.php?fbid=10160686606405430&set=p.10160686606405430&type=3&theater&ifg=1

\version "2.19.54"
\score {
\new Staff {
\key c \major
\numericTimeSignature \time 2/4
<f'' a''>8
<f'' a''>8 -> ~ (
<f'' a''>8
<f'' a''>8 )
}
}

I thought I'd try my hand at getting a lilypond version that matched.

The main difference being the placement of the lower tie,
which appears in the 3rd, rather than the 4th staff space in lilypond.

The other details, like the length and thickness are easily enough dealt
with.

I could get the lower tie to look pretty close using \shape ... Tie.

But since this is a chord, that only affects the bottom tie.

Two questions: how does one address the upper tie?
Second question:  is it possible to affect such things globally,
rather than on a per-shape basis?  Or is this where we go into \shapeII
territory?

\score {
\new Staff {
\key c \major
\numericTimeSignature \time 2/4
<f'' a''>8
\shape #'((0.4 . 0.8) (0.2 . 0.9) (0.3 . 0.9) (0.1 . 0.8)) Tie
<f'' a''>8 -> ~ (
<f'' a''>8
<f'' a''>8 )
}
\layout {
    \context {
    \Staff
    \override Tie.minimum-length = 3.5
    \override Tie #'thickness = #1.9
    }
}
}

%{
I tried banging on these other ususal suspects,
but none of them had an effect on which staff space the tie was placed:

\layout {
    \context {
        \Staff
        \override Tie.height-limit = 0.2
        \override Tie.ratio = 0.2
        \override Tie.details.free-head-distance = 0.5
    }
}
%}



Thanks,

Elaine Alt
415 . 341 .4954                                           "*Confusion is
highly underrated*"
address@hidden
Producer ~ Composer ~ Instrumentalist
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