2-I happily found a section of "Specific Instrument Notation" on the
Lilypond-manual, with a section dedicated to the guitar. There I saw the
possibility of setting "String-number indicators" for chords. I think it would
be good if the String-number indicators could be set to any note, including
melodic lines. This is an important topic in guitar. I know they can be set
also with \markup{\circle {n}}, but why not in a similar way as in chords: <a\n
b\m> ?
4-In guitar (as in other string instruments), there is the possibility of making
an "arpeggio" of two exactly notes, played in different strings. For example:
\relative{
e8. d' e
<b, b>8.\arpeggio
}
One of the "b" notes is played on the third string and the other on the second,
so the arpeggio can be made. But the Lilypond 2.8 display the following
message:
programming error: no heads for arpeggio found?
The arpeggio is working in "regular" chords, in other places of the score.