\consists "Pitch_squash_engraver"
squashedPosition = 0
+ %% generate no ledger lines, needed for staves with custom
+ %% line positions and ledger lines that appear inside the staff
+ \override NoteHead.no-ledgers = ##t
+
%% the engravers that control the 'busy' flags for note-onsets and melismata
\consists "Grob_pq_engraver"
\consists "Tie_engraver"