\time 4/4
\once \override TextScript.stencil =
#(make-stencil-boxer 0.1 0.3 ly:text-interface::print)
r1\fermata-\markup{\teeny "wait for viola cue"}\stopTextSpan^"B"
%%%%%%%%%%%%%%%%%%%%%%%%%%%
However the above applies a stencil boxer to the markup below the staff in addition to the string "B". I would only like to add the stencil boxer to the letter "B" above the staff. I understand that I should use a tweak except when I try the above in the Tweak syntax, I get an error.
Thanks!
Ryan.
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ॐ नमः शिवाय