hello Trevor,
try adding
\remove "Forbid_line_break_engraver"
to your context(s).
You may want to add this as a default for all you're voices in
\layout{
\context{\Voice
\remove "Forbid_line_break_engraver"
}
}
read
11.6.5 Proportional Notation
in the manual.
best,
Victor.
I've been unable to discover how to permit line-breaking
when there is a long sequence of tuplets which cross
barlines. Beams and Glissandos subscribe to the
unbreakable-spanner-interface, so line-breaking when these
cross barlines may be permitted by setting #'breakable =
##t. But TupletBracket