Using the \tweak command to tweak individual grobs
With the \tweak
command, every grob can be tuned
directly. Here are some examples of available tweaks.
\relative c' { \time 2/4 \set fingeringOrientations = #'(right) < \tweak font-size #3 c \tweak color #red d-\tweak font-size #8 -4 \tweak style #'cross g \tweak duration-log #2 a >2 }