Hello,
(Separately reply follows to some of the specific things that were
written.)
In case there is interest, what I did now was tweaking the
Current_chord_text_engraver from scheme_engravers.scm. It simply takes
the first pitch specified in a chord as the root, takes the first one
with property "bass" as the bass, and it additionally listens to
text-script-events from which it takes the first specified one as the
suffix. I use that in a custom context called "HarmonicBackground" for
lack of something better, same as ChordNames but with this engraver
instead of the original one. For the input I just use relative mode.
An example of how I specify the chord symbols now:
chords = \relative {
<f \over ees>^"7"
des^"lyd"
}
\new HarmonicBackground {
\chords
}
Code can be found here:
https://gitlab.com/kbvw/lilypond-tweaks/-/blob/master/harmonic-background.ly
It's probably not foolproof; I'm a novice with both LilyPond and
Scheme. Currently the text-script is hard-coded to go in the
superscript of the chord, before the slash separator. Perhaps it would
be nicer to look if the text-script is entered with ^ or _, and even
nicer would be to use shorthands in an input mode such as the chord
mode, but I didn't look at any of the input/parser code yet.
For myself that suffices for now; it looks good to me on the page and
it's easy/flexible to enter.
If anyone more knowledgeable thinks it's worth continuing with, I'd be
happy to discuss/help! (I can see several advantages and disadvantages.)
All the best, and thanks for the help,
Koen
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