Preventing extra naturals from being automatically added
In accordance with traditional typesetting rules, a natural sign is
printed before a sharp or flat if a previous double sharp or flat on
the same note is canceled. To change this behavior to contemporary
practice, set the extraNatural property to #f in the
Staff context.
\relative c'' { aeses4 aes ais a \set Staff.extraNatural = ##f aeses4 aes ais a }