Hi, Oops--should have included the version. I'm using 2.15.37. With 2.14.2 and before you need the dollar sign:
>
> shapeTie =
> #(define-music-function (parser location offsets) (list?)
> #{
> \once \override Tie #'control-points = #(alter-curve $offsets)
> #})
>
>
-David
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