that's nice but you may want to look at the fingeringSlideEngraver
http://lists.gnu.org/archive/html/lilypond-user/2014-02/txt3tFIgdpIld.txt
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i just redid my guide finger if anyone is interested
\version 2.18.2
5
#(define (fingering-event? m) (and (ly:music? m)
(music-is-of-type? m 'fingering-event)))
gf =
#(define-event-function (parser location num str fingering)
(number? number? fingering-event?)
(let*
