Aaron, Thank you so much, this worked perfectly.
On 11/17/2021 7:50 PM, Aaron Hill wrote:
%%%% \version "2.20.0" boxify = #(define-music-function (grob-path) (key-list?) (define proc (grob-transformer 'stencil (lambda (grob orig) (grob-interpret-markup grob #{ \markup \override #'(box-padding . 0.25) \override #'(thickness . 2) \box \stencil #orig #})))) #{ \override $grob-path . stencil = #proc #}) \new Staff \with { \consists Measure_counter_engraver \boxify MeasureCounter } { \boxify Staff.Clef \startMeasureCount fis'4 g'8 a' \once \boxify Accidental bes'2 cis''4 d''2. \stopMeasureCount } %%%%