Hi Mansour, The Notation Reference manual can be difficult to follow at first. We all suffer that.
Now that it's cleared up, just by way of example I use this: dynamicsX-offset = #(define-music-function (offset) (number?) #{ \once \override DynamicText.X-offset = $offset \once \override DynamicLineSpanner.Y-offset = #0 #}) If you are using 2.18 you need to use the parser and location arguments - no longer needed in recent versions. I can't remember why you need to set the line spanner offset as well. But at the time I wrote this it seemed necessary. Could be redundant. Andrew
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