Hi Claire! There is also another mistake in your code:
When you use \override it’s supposed to be followed by a Grob name and the property that’s going to be overridden, like \override Stem.direction = #UP When using the commands \stemUp and \stemDown you just write for instance \once \stemUp, without \override HTH \Leo > 12 sep. 2020 kl. 22:28 skrev Claire Meyer > <claire.meyer.bourhis.lilyp...@gmail.com>: > > Hi all, > > I'm trying to change a grace note's stem direction, to no avail. I tried both > : > > \acciaccatura \once \override \stemUp aes > > and > > \once \override \stemUp \acciaccatura aes > > and both produce errors. How do I do it ? > > Thanks in advance :) > > Claire
