Re: Potential bug: Slur begins or ends with tenuto

[Simon Albrecht]

On 11.11.2016 23:54, Daniel Rosen wrote:
> It appears that LilyPond is refusing to allow Slur.positions to be specified in 
> increments smaller than 0.5 staff spaces.

Indeed the positions property does not set staff positions directly at 
all. To understand, one has to know how LilyPond draws slurs in the 
first place: It tries out a number of candidates and the one with the 
best score (or rather the least demerit) is chosen – a heuristic 
algorithm[1][2]. Now, setting the positions property can only influence 
which of the candidates will be chosen. If there is no candidate 
matching your choice of positions, the closest one will be chosen. For 
finer control, you need \shape.

HTH, Simon

[1] This is explained in more depth in the LilyPond essay, I think.
[2] I think there is a way to have more candidates be created, but I 
don’t recall how, sorry.