Re: color change working in only upper staff

[Francesco Napoleoni]

> lower = \relative c {
>    \override Fingering.color = #red

This line could be changed to read

>    \override Staff.Fingering.color = #red

which “speaks” to the right context.

You could also replace the two \override with something like this:

> \score {
>    \new PianoStaff <<
>      \set PianoStaff.instrumentName = #"Piano  "
>      \override PianoStaff.Fingering.color = #red

which affects all the Staff contexts included.

Cheers
Francesco Napoleoni