Re: type `direction'

[Jérémie Lumbroso]

AAJ> \property Voice.Slur \set #'direction = #'up
You mean:

 \set #'direction = #1                     for "up" and
 \set #'direction = #-1                    for "down"

 
But why not simply make use of the shortcuts as defined in the
'property-init.ly' file:

 \slurDown a ( ) b \slurUp a ( ) b

--
Jérémie