for a solitary bass note I want to have a bass clef, not affecting
anything else in the staff. How can I fix the attached example? I
guess I need a music function that adjusts the vertical note offset
of the upper voice...
Could you use an "ossia" that overlaps the staff? [...]
A very nice idea, thanks! I admit that I would never have thought of
that. Your example is almost perfect, except that I would like to
avoid the horizontal gap caused by bass clef. What property controls
that? I tried to modify some `Clef' properties given in
`define-grobs.scm', but I didn't get the desired effect.