They have been implemented in a way which may look rather ugly, but we think it is the only way of implementing in one pass ties and slurs which run across glue.
Slurs and ties must be initiated within the pair normalshapemediumseries\
notes...normalshapemediumseries\notes before the spacing note is coded. They must be
terminated also before the last note is coded.
normalshapemediumseriesnormalshapemediumseries\itenu np
(ten stands for the Italian word tenuto)
initiates an upper tie (convex) at pitch p. Just like beams, ties have a
reference number n, from 0 to 6 (or 9 if normalshapemediumseriesmusicadd is included).
normalshapemediumseriesnormalshapemediumseries\itenl np initiates a lower tie (concave).
The tie of reference number n is terminated by
normalshapemediumseriesnormalshapemediumseries\tten n.
Slurs are initiated with
normalshapemediumseriesnormalshapemediumseries\ilegu np and
normalshapemediumseriesnormalshapemediumseries\ilegl np, where leg stands for the Italian word
legato, and they are terminated with
normalshapemediumseriesnormalshapemediumseries\tleg n. Except that
slurs start before the note position and stop after, ties and slurs work the
same way with the same syntax. They also share the same registers so that
slurs nesting tied notes should have numbers n distinct from each other.