trillspan

[E Appeldoorn]

I wanted to move a TrillSpann downwards to within the bar on the middle barline.

I finaly came up with

\once \override TrillSpanner.Y-offset = #-2 \startTrillSpan a4*5 \stopTrillSpan

But got an error 'unbound TrillSpannEvent' and nothing has changed.

So how do I move that TrillSpanner southwards?

(version 22.2.1)

Thanks.

vriendelijke groet, Erik Appeldoorn