;; todo: clean this up a bit: the list is getting
;; rather long.
(molecule-callback . ,Beam::brew_molecule)
- (thickness . 0.48) ; in staff-space
+ (thickness . 0.42) ; in staff-space, should use stafflinethick?
(before-line-breaking-callback . ,Beam::before_line_breaking)
(after-line-breaking-callback . ,Beam::after_line_breaking)
(default-neutral-direction . 1)