>> I see that the function also listens to `basic-distance` (probably
>> from `VerticalAxisGroup`), but I wasn't able to trigger it – most
>> probably, this code part is not specific to figured bass.
>
> I think this should do (I can elaborate when I have more time):
>
> \version "2.22.2"
>
> \figures {
> \override BassFigureLine.staff-staff-spacing =
> #'((basic-distance . 0)
> (minimum-distance . 1.6)
> (padding . -inf.0)
> (stretchability . 0))
> < f I \markup r >
> }
Aah, not `VerticalAxisGroup` but `BassFigureLine` it is! Excellent,
thanks!
One question remains, however: Why `staff-staff-spacing` and not
`nonstaff-nonstaff-spacing`? Or to ask the question differently: How
can I recognize the difference between 'staff' and 'nonstaff' material
in general?
Werner