I have been using PMX for seven years, but confess to still basically being in 
the dark about the difference between font-based s and t slurs.  So I did 
some systematic experiments.

Here is everything the PMX Reference Manual has to say on the topic.

"With font-based slurs, t is equivalent to s but with several minor 
differences to be explained later. ... ID codes cannot be used with 
font-based t slurs. ...  For font-based slurs, the unique aspect of t slurs 
is that if one starts or ends on the same note as an s slur, the former will 
be moved away from the notehead to avoid a collision. This only works if 
neither slur has an ID code. This feature is only retained for backward 
compatibility. ... To specify a font-based tie in PMX, use a slur command and 
include the option t in it, somewhere after the initial ( , ) , s or t." 

In practice, some not-so-minor differences are encountered.  The first of 
these flatly contradicts the User's Manual.

c44 d e f g a b g c2 tt c tt
ERROR in line 17, bar 3 Cannot use "t" as an option on a tie

c44 d e f g a b g c2 t-1 c t-1
ERROR in line 17, bar 3 "+|-" for slur height only allowed in "s"-slurs

Thus, t is indeed a poor brother of s, its only virtue being that in one very 
special case its use saves one some manual adjustment.

I suspect the original reason for the "t" slur was only because, before 
labelled slurs, one needed two different slur symbols in the slur-over-a-tie 
situation.

Given that the use of labelled slurs now allows enormous flexibility, it seems 
that the t slur is retained in PMX for the sake of backward compatibility 
only.  New scores need not use it at all.  Am I wrong in saying this?

Dirk

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